2nd Year Physics Chapter 12 Electrostatics Notes MCQs Solutions

physics 12th notes mcqs chapter 12

1. The number of electric field lines passing through a certain element of area is called:

 
 
 
 

2. The number of electrons in one coulomb charge is equal to:

 
 
 
 

3. If both the magnitude of charge and distance between them is doubled, then coubled, then coulomb’s force 

 
 
 
 

4. Closeness of the electric field lines in the measure of

 
 
 
 

5. speed of charging and discharging of a capacitor depends on
resistance &

 
 
 
 

6. When current of one ampere is flowing across any cross-section of wire in one second, then the quantity of charge is said to be:

 
 
 
 

7. If a oil droplet between two oppositely charged parallel plates is suspended then:

 
 
 
 

8. Which one is a photo conductor?

 
 
 
 

9. Dielectric is also called

 
 
 
 

10. Selenium is an insulator in the dark but when exposed to light it
becomes

 
 
 
 

11. SI unit of capacitance is

 
 
 
 

12. Energy stored in a capacitor is given by the formula

 
 
 
 

13. The charges on the parallel plates of capacitor possess:

 
 
 
 

14. If the distance between the two charge bodies is halved, the force between them becomes:

 
 
 
 

15. The word “Xerography” means:

 
 
 
 

16. What will be the electrostatic force of repulsion between two electrons at I metre : 

 
 
 
 

17. The unit of electric intensity is:               

 
 
 
 

18. The SI unit of electric flux is:                   

 
 
 
 

19. 1 micro coulomb is equal to

 
 
 
 

20. Capacitance of a parallel plate capacitor depends on

 
 
 
 

21. Two opposite point charge of same magnitude separated by distance 2d, electric potential mid-way between them is:

 
 
 
 

22. If the distance between the two charged bodies is halved, the force between them becomes

 
 
 
 

23. When a surface is held parallel to E then flux is

 
 
 
 

24. The unit of energy density of electric field is

 
 
 
 

25. If a charged body is moving against the electric field it will gain

 
 
 
 

26. Electric potential is:

 
 
 
 

27. The concept of electric field theory was introduced by:

 
 
 
 

28. Capacitor is a device used for:

 
 
 
 

29. Work done in bringing a unit positive charge from infinity to that point in an electric field is:

 
 
 
 

30. Free electrons are:

 
 
 
 

31. Intensity of field inside a Hallow charged sphere is:

 
 
 
 

32. What will be the potential on its surface will be:

 
 
 
 

33. Coulomb multiplied by volt gives the unit will be called:

 
 
 
 

34. When placed in a medium of r = 80, the force will be reduced to:

 
 
 
 

35. A capacitor’s capacitance can be increased by:

 
 
 
 

36. Presence of dielectric always

 
 
 
 

37. The electric force between two charges placed in air is 2N. when
placed in a medium of εr=80, the force reduces to

 
 
 
 

38. The direction of electric intensity is:      

 
 
 
 

39. The voltage across the capacitor at any instant can be obtained by:

 
 
 
 

40. The force between two similar unit charges placed one meter apart in air is:

 
 
 
 

41. The electric flux is given by the expression:

 
 
 
 

42. The electric lines of force determine the strength of an:

 
 
 
 

43. Another name for electric potential energy per unit charge is:           

 
 
 
 

44. Electric flux is given by the formula

 
 
 
 

45. A device used for storing charge is called

 
 
 
 

46. When separated by a medium of relative permittivity 2 the between them becomes

 
 
 
 

47. Three capacitors of capacitance 1µ farad each are connected in series.
Their equivalent capacitance is

 
 
 
 

48. The value of capacitance depends upon:           

 
 
 
 

49. The value of K depends upon:

 
 
 
 

50. Electric field intensity between oppositely charged parallel plates

 
 
 
 

51. The photo copying process is called

 
 
 
 

52. The practical application of electrostatic is:

 
 
 
 

53. A particle having 2e charge falls through a potential difference of 5V Energy acquired by it

 
 
 
 

54. If we increase the charge, the capacitance:                   

 
 
 
 

55. The formula for energy density is valid for only:

 
 
 
 

56. The force per unit charge is known as

 
 
 
 

57. lf a charged body is moved against the electric field, it will gain:

 
 
 
 

58. The electric field lines emerge from the charges in:

 
 
 
 

59. If a dielectric is inserted b/w the plates of a charged capacitor, its
capacitance

 
 
 
 

60. Electric flux due to point charge is

 
 
 
 

61. The SI unit of charge is:

 
 
 
 

62. The relation (∆V/∆r=V/d) represents

 
 
 
 

63. The SI units of Coulomb’s constant are

 
 
 
 

64. Since selenium becomes conductor in light it is called

 
 
 
 

65. The magnitude of electric field between two point can be calculated by
the relation

 
 
 
 

66. The unit of Fe/Fg is:      

 
 
 
 

67. The SI unit of potential difference is

 
 
 
 

68. The electric field lines are closer where the field is:

 
 
 
 

69. An ECG records the between points on human skin generated by electric process in the heart

 
 
 
 

70. The fact that Electric Field exists in space around an electrical charge is

 
 
 
 

71. The earth’s potential is considered as:   

 
 
 
 

72. The Coulomb force is:

 
 
 
 

73. Origin of the gravitational and electric forces:  

 
 
 
 

74. Electric flux due to a point charge q present inside a closed surface can
be calculated by

 
 
 
 

75. Electric field intensity due to an infinite sheet of charge is given by

 
 
 
 

76. If the distance between two charges is doubled, the electric force
between them will become

 
 
 
 

77. Capacitance of a parallel plate capacitor is given by

 
 
 
 

78. special dry black powder is spread over the drum of photocopier is
called

 
 
 
 

79. The force per unit charge is called:

 
 
 
 

80. Which of the following statement is correct:

 
 
 
 

81. Gauss’s law can only be applied to a surface

 
 
 
 

82. In a charged capacitor the energy resides in

 
 
 
 

83. If the distance between two charges is doubled, the electric force
between them will become

 
 
 
 

84. The term RC has the same unit as that of (RC= )

 
 
 
 

85. The direction of field lines around an isolated charge “-q” is 

 
 
 
 

86. If a slab of dielectric is inserted b/w the plates of a parallel plate
capacitor connected across a battery. its stored energy

 
 
 
 

87. A charge of 0.10 C accelerated through a potential difference of 1000 volt acquires K.E.

 
 
 
 

88. The SI unit of electric field intensity(strength) E is

 
 
 
 

89. Electron energy is one electron volt when it is accelerated through a
potential difference of

 
 
 
 

90. The electric field will be uniform

 
 
 
 

91. An important part of inkjet printer is:                 

 
 
 
 

92. The number of electric lines of force passing through certain area is known as:

 
 
 
 

93. The charge on the electron was measured by Millikan in:

 
 
 
 

94. The force experience by unit positive charge placed at a point in an electric field is called:

 
 
 
 

95. Xerography means

 
 
 
 

96. The direction of field lines due to a charge +q

 
 
 
 

97. Electric field intensity due to a point charge at distance r is equal to

 
 
 
 

98. Electric flux is a:    

 
 
 
 

99. If the atomic number of copper is 29, the contribution of electrons per
atom in the block of copper will be

 
 
 
 

100. Two oppositely charged balls A & B attract third ball C when placed
near them turn by turn. Then ball C must be

 
 
 
 

101. The toner of the printer is given

 
 
 
 

102. Farad is the unit of:                      

 
 
 
 

103. Gauss’s Law can only be applied to:                             

 
 
 
 

104. The electric field exist around:

 
 
 
 

105. Force experienced by a unit positive charge placed at a point in an
electric field is known as

 
 
 
 

106. In a charged capacitor energy resides in the form of

 
 
 
 

107. In a region where the electric field is zero the electric potential is always:

 
 
 
 

108. The constant of proportionality “K” depend upon:

 
 
 
 

109. Electric field intensity inside a hollow charged sphere is

 
 
 
 

110. A charge of 10and 14.4 are 12 cm apart, the force between them is:

 
 
 
 

111. A substance contains:

 
 
 
 

112. Two 50 µF capacitors are connected in parallel their equivalent
capacitance

 
 
 
 

113. A radio tunning capacitor is a:                

 
 
 
 

114. Selenium is a

 
 
 
 

115. In  = EA cos, the angle  is the angle between the field lines and:

 
 
 
 

116. The value of K in SI system of units:      

 
 
 
 

117. When a dielectric is placed in an electric field it

 
 
 
 

118. The force in medium of relative permittivity εr is given by

 
 
 
 

119. In a charged capacitor, the energy is stored due to:

 
 
 
 

120. The change of potential w.r.t displacement is called:

 
 
 
 

121. Capacitance of a parallel plate capacitor does not depend on

 
 
 
 

122. The inkjet printer ejects a thin stream of:

 
 
 
 

123. Farad =

 
 
 
 

124. The branch of physics which deals with the charges at rest:

 
 
 
 

125. An electron volt is the unit of a:

 
 
 
 

126. The SI units of permitivity are:

 
 
 
 

127. Electron volt is the unit of

 
 
 
 

128. Work done in moving a charge (unit positive charge) from one point to another against the electric field is measure of:

 
 
 
 

129. The electric intensity is a:            

 
 
 
 

130. An important port of a photocopier is:               

 
 
 
 

131. The value of  r for various dielectrics will always:

 
 
 
 

132. Which of the following forces is only repulsive:           

 
 
 
 

133. Energy density in case of capacitor is always proportional to

 
 
 
 

134. Which of the following can be taken as measure of electric field
intensity

 
 
 
 

135. The value of relative permittivity for all the dielectrics other than air or vacuum is always

 
 
 
 

136. 4 µF & 2 µF are connected in series, their equivalent capacitance is

 
 
 
 

137. If we place a dielectric of Ɛr1 between, the charges, then force become equal to

 
 
 
 

138. The electric intensity at a distance of 1m from the point charge is IBC is:

 
 
 
 

139. The electric field created by positive charge is:

 
 
 
 

140. A potential difference b/w two points is one volt. The amount of work
done in moving a charge of one coulomb from one point to another is

 
 
 
 

141. One Electron Volt is equal to

 
 
 
 

142. Faraday is a scientist:

 
 
 
 

143. The potential of all the points of a equi potential surface is

 
 
 
 

144. Energy acquired by it is

 
 
 
 

145. Capacitance and potential difference are:                     

 
 
 
 

146. Photo copier and the inkjet printer are examples of

 
 
 
 

147. Charge on an electron was determined by

 
 
 
 

148. Another term used to mean electric lines of force is:

 
 
 
 

149. The potential at a point situated at a distance of 50 cm from a charge of 5gc is:

 
 
 
 

150. The SI unit of charge is:

 
 
 
 

151. The electric potential at a point due to a point charge is given by V=

 
 
 
 

152. When the field is strong, the lines of force are:

 
 
 
 

153. The interior of a hollow charged sphere is a:                

 
 
 
 

154. For the computation of electric flux, surface area should be

 
 
 
 

155. The electric intensity at infinite distance from the point charge is:

 
 
 
 

156. Force between two similar unit charges placed one meter apart in air is

 
 
 
 

157. Two charges 1 c and 5 c separated by 20 cm, the ratio of electrical forces acting on them will be:

 
 
 
 

158. The relative permitivity of air is:

 
 
 
 

159. A is applied when the area is:

 
 
 
 

160. The minimum charge on an object can not be less than

 
 
 
 

161. The amount of energy acquired or lost by an alpha particle as it moves through potential difference of 1 V is:

 
 
 
 

162. SI unit of electric flux is

 
 
 
 

163. When the medium is insulator the electrostatic force between the charges is:

 
 
 
 

164. Photo copier and inkjet printer are the application of:

 
 
 
 

165. Another unit of electric intensity can be expressed as:

 
 
 
 

166. Michael Faraday was known by his work on:    

 
 
 
 

167. The electric flux through any surface depends upon:

 
 
 
 

168. Electric potential energy per unit charge is also called

 
 
 
 

169. What is standard to measure the relative permittivity:

 
 
 
 

170. In case of two identical charges placed at certain distance, the electric lines of force are:

 
 
 
 

171. Charles Augustus Coulomb measured the force between two charges
by

 
 
 
 

172. SI unit of charge is

 
 
 
 

173. The electric lines of force are directed away from:

 
 
 
 

174. Presence of dielectric between two charges always:

 
 
 
 

175. An electric field can deflect

 
 
 
 

176. Concept of electric field theory was introduced by

 
 
 
 

177. The electrostatic force of repulsion between two electrons at a distance 1m is:

 
 
 
 

178. A 50µF capacitor has a potential difference of 8V cross it. The charge
on the capacitor is

 
 
 
 

179. An inkjet printer uses in its operation:               

 
 
 
 

180. The minimum charge on any electron be less than:

 
 
 
 

181. If an electron is accelerated through a potential difference of one volt
it will acquire energy

 
 
 
 

182. An example of photoconductor is:

 
 
 
 

183. Special organ called Ampullae of lorenzini that are very sensitive to electric field are found in:

 
 
 
 

184. E =

 
 
 
 

185. The symbol e r denotes for:

 
 
 
 

186. The value of permitivity of free space:

 
 
 
 

187. The force b/w two point charges in air or vacuum is F. if air or vacuum
is replaced by an insulator of relative permittivity εr the force b/w charges

 
 
 
 

188. Two point charges +2C and +6C repel each other if a charge 0f
-2C is given to each of them then electrostatic force between them is

 
 
 
 

189. The dielectric consists of atoms and molecules which are:

 
 
 
 

190. Selenium is:

 
 
 
 

191. When dielectric is placed between the plates it decrease the:

 
 
 
 

192. The interior of a hollow charged metal sphere is a region which is:

 
 
 
 

193. The number of free electrons in one coulomb charge is

 
 
 
 

194. The magnitude of charge on an electron is

 
 
 
 

195. A Particle carrying a charge of 2e falls through potential difference of 3V.The energy acquired by it will be

 
 
 
 

196. If the medium between the charges is not free space then electrostatic force will:

 
 
 
 

197. Unit of capacitance is

 
 
 
 

198. The negative of the potential gradiant is:

 
 
 
 

199. Electric flux through any surface depend on

 
 
 
 

200. If an electron of charge “e” is accelerated a potential difference V it will acquire energy:

 
 
 
 

201. Which of the following forces are conservative:

 
 
 
 

202. The work done in moving a positive charge on an equipotential surface is:

 
 
 
 

203. Concept of electric field was given by

 
 
 
 

204. Value of   Ɛr for air is;

 
 
 
 

205. Metals are good conductors of electricity because they have

 
 
 
 

206. Unit of electric field intensity is

 
 
 
 

207. The drum in a photocopier is coated with a layer of:

 
 
 
 

208. The surface charge density is defined as:

 
 
 
 

209. The space around the charge within which other charges are influenced by it is called:

 
 
 
 

210. The Millikan’s experiment apparatus also contains:

 
 
 
 

211. The electric field created by positive charge is

 
 
 
 

212. Value of dielectric constant for air or vacuum is

 
 
 
 

213. For a capacitor , the charge per unit volt is called

 
 
 
 

214. Electric charge of 100µC is 13cm apart from another charge 16.9µC.
The force between them in Newton is

 
 
 
 

215. The electrostatic force of repulsion between two electrons at a
distance of one meter is

 
 
 
 

216. The copying process is called

 
 
 
 

217. According to gauss’s law , the flux through any closed surface is

 
 
 
 

218. Charge on an electron was measured by Millikan in

 
 
 
 

219. Relative permittivity for air is:

 
 
 
 

220. NC⁻¹ is the Sl unit of:

 
 
 
 

221. An electric field can not deflect

 
 
 
 

222. The charge on the droplet in Millikan experiment is calculated by
formula

 
 
 
 

Short Questions

1. A charge particle is placed in an electric field what is the force on the particle if the charge on the particle is doubled ?
2. Can there be a potential difference between two conductors that carry like charges of the same magnitude?
3. Can two equipotential surfaces inter-sect each other?
4. Convert joule in electron volt?
5. Define an electric field ?
6. Define capacitance of the capacitor?
7. Define conductor ?
8. Define dielectria constant for capacitors.Also write its unit?
9. Define dielectric constant &, for capacitors ?
10. Define electric dipole moment?
11. Define electric field intensity and also write
12. Define electric flux ?
13. Define electric potential?
14. Define electrical potential?
15. Define farad ?
16. Define potential difference between two points.Give its unit and define it?
17. Define potential difference between two points?
18. Define relative permittivity or dielectric
19. Define time constant of a capacitor ?
20. Define volt?
21. Describe five properties of electric field lines?
22. Describe the charging of a capacitor by battery assuming the positive charge as transferred?
23. Describe the conditions for the maximum
24. Describe the factors upon which the capacitance of a capacitor depends?
25. Describe the force or force on a positive point charge when placed between parallel plates? a) With similar and equal charges. b) With opposite and equal charges.
26. Describe the principle of Millikan’s oil drop method?
27. Describe the working of inkjet printer briefly?
28. Do electrons tend to go to region of high potential or of low potential?
29. Electric lines of forces never cross?
30. Explain briefly the term’’ potential gradient?
31. Explain the term potential gradient?
32. Explain the working of inkject printer ?
33. Gauss’s law has been derived by assuming that the charge enclosed by a closed surface is positive.If q negative what happens to the field lines?
34. Generally bow many methods are used for connecting capacitors ?
35. Give some important properties of electric
36. Give the SI unit of absolute potential and
37. How can we shield any apparatus from electric field?
38. How can you identify that which plate of a capacitor is positively charged ?
39. How can you increase the capacity of a capacitor?
40. How solids get charge ?
41. How would you show that the electrostatic force on a charged object is independent of its mass?
42. If a point charge q of mass m is released in a non-uniform electric field will it make a rectilinear motion?
43. If area A is inclined at an angle e with the field lines, then what is the flux ?
44. If the absolute potential at a point is zero what can you say about the electric intensity there?
45. If the distance between two point charges is halved,what will happen to the force between them?
46. In a charged capacitor which form of the energy stored ?
47. Is Coulomb’s electrostatic interaction consistent with Newton’s third law?
48. Is E necessarily zero inside a charged rubber balloon if balloon is spherical?Assume that charge is distributed uniformly over the surface?
49. Is electron volt (eV) a unit of potential difference or energy?
50. Is it possible for an electrostatic field lines to intersect?
51. Is it true that Gauss’s law states that the total number of lines of forces crossing any closed surface in the outward direction is proportional to the net positive charge enclosed with in surface?
52. Prove that 1volt/1meter = 1Newton /1Coulomb ?
53. Show that 1 ev = 6 x 10⁻¹⁹ J?
54. State Coulomb’s law?
55. State Gauss’s law?
56. Suppose that you follow an electric field line due to a positive charge.Do electric field and the potential increase or decrease?
57. The potential is constant throughout a given region of space.Is the electrical field zero or nonzero in this region?
58. What a charge produces in the space surrounding it?
59. What are electric field lines, give their importance ?
60. What are the factors upon which the electric flux depends?
61. What do you under stand by electric field lines?
62. What happens to a capacitance in case of presence of any medium between the plates of a capacitor ?
63. What happens when a dielectric material is placed in an electric field ?
64. What is a capacitor?
65. What is an electric dipole ?
66. What is an electric field?
67. What is an electric force ?
68. What is an ideal electric dipole ?
69. What is an insulator?
70. What is Capacitor?
71. What is coulomb’s force in a medium of
72. What is electrostatics?
73. What is Farad?Define it?
74. What is Gaussian surface ?
75. What is meant by electric polarization?
76. What is one electron-volt ?
77. What is Physics ?
78. What is the angle which the lines of force make with the surface of a good conductor ?
79. What is the capacitance of a parallel plate capacitor ?
80. What is the difference between electrical potential energy and the electrical potential difference?
81. What is the effect of medium on coulomb’s force ?
82. What is the effect of medium between the charges upon coulomb’s force?
83. What is the electric field on a sphere of radius r1 placed inside a concentric sphere of radius r.There is a charge bigger sphere.Give brief reason for your answer?
84. What is the electric flald Intensity between two oppositely charged parallel plates ?
85. What is the electric flux through a closed surface with a charge q placed at its centre ?
86. What is the electric intensity of field inside a
87. What is the law of electrostatics ?
88. What is the result of Millikan’s oil drop method ?
89. What is the SI unit of capacitance ?
90. What is the SI unit of electric flux ?
91. What is the unit of potential difference?
92. What is the value of permittivity of free space & in Sl units ?
93. What is the value of relative permittivity of
94. What is the value of relative permittivity of glass ?
95. What is the value of relative permittivity of vacuum ?
96. What is time constant of a capacitor?
97. What is xerography ?
98. What is xerography or photocopier ?
99. What will be flux through a surface placed at right angle to the electric field?
100. What will be the flux through a closed surface which does not contain any charge?
101. When we move in an electric field the potential changes at the rate of 10 v/m.What is the electric intensity?
102. Whether coulomb’s law enables us to calculate the magnitude or direction of the electric
103. Whether potential difference is a scalar quantity ?
104. Whether potential is a vector quantity ?
105. Whether the electric field intensity is a scalar or vector quantity ?
106. Whether the electric flux is a vector quantity?
107. Whether the electrostatic force. is conservative force ?
108. Whether the gravitational constant ‘G’ is larger as compared to electric constant ‘K’ ?
109. Whether the gravitational force is conservative force ?
110. Whether the gravitational force is weak force as compared to electrostatic force ?
111. Who determined the charge on an electron ?
112. Why does each plate of a capacitor receive same amount of change during charging of a capacitor?
113. Why does each plate of a capacitor receives same amount of charge during charging a capacitor?
114. Why does spherical symmetry of a sphere shell demand the E due to charge q ar the center of shere be constant over the surface?
115. Why does the charge given to the conductor tend to reside on the surface of the conductor ?
116. Write any application of electric field lines?
117. Write any one use of charging and discharging of a capacitor ?
118. Write any two difference between gravitational and electric forces ?
119. Write down the relation for absolute potential?

Long Questions

1. State and explain coulomb’s law.
2. Describe the fields of force.
3. What is the vector form of Coulomb’s law?
4. What is the effect of medium on the Coulomb’s force?
5. Define electric field and electric field intensity. Also calculate the electric field intensity due to a point charge.
6. Describe the electric field lines. Write some properties of electric lines of force.
7. Describe xerography in detail.
8. What is the inkjet printers?
9. Define electric flux. Also discuss its particular cases.
10. Calculate the electric flux through a surface enclosing a charge.
11. Calculate the intensity of field inside a Hollow charged sphere.
12. Calculate the electric intensity due to an infinite sheet of charge.
13. Calculate the electric intensity between two oppositely charged parallel plates.
14. Describe electric potential and potential difference with its units.
15. Explain the electric field as potential gradient.
16. Define absolute potential. Also calculate the potential at a point due to a point charge.
17. Compare the electric and gravitational forces.
18. How Millikan’s method can be used to determine the charge?
19. Define capacitor and what is the parallel plate capacitor? Also define capacitance with its units.
20. Describe the capacitance of a parallel plate capacitor. Also discuss the effect of medium on capacitance.
21. What is the electric polarization of dielectrics?
22. Calculate the energy stored in a capacitor.
23. Describe the charging and discharging of a capacitor.
24. Compare magnitudes of electrical and gravitational force exerted on an object (mass 20 g charge = 20 micro C) by an identical object that is placed 10 cm from the first. (G = 6.67 x 10⁻¹¹ Nm²kg⁻²)
25. A point charge q = -8 x 10⁻⁸ C is placed at the origin. Calculate electric field at a point 2 m from the origin on the z axis?
26. Determine the electric field at the position r = (4i + 3j) m caused by as point charge q = 5 x 10⁻⁶ placed at origin.
27. Two point charges, q1 = -1 x 10⁻⁶ C and q2 = 4 x 10⁻⁶ C, separated by a distance of 3 m. Find and justify the zero field location.
28. Find the electric field strength required to hold suspended particle of mass 1 x 10⁻⁶ kg and charge 1 micro C between two plates 10 cm apart.
29. A particle having a charge of 20 electrons on it falls through a potential difference of 100 volts. Calculate the energy acquired by it in electron volts (eV).
“30. In Millikan’s experiment, oil droplets are introduced into the space between two flat horizontal plates, 500 mm apart. The plate voltage is adjusted to exactly 780 Volts so that the droplet is held stationary. The plate voltage is switched off and the selected droplet is observed to fall a measured distance of 50 mm in 12 s. Given that the density of the oil used is 9000kgm(-3), and the viscosity of air at laboratory temperature is 8 x 10⁻⁵ Nm⁻²s, calculate:
(a) the mass, and
(b) the charge on the droplet (assume g = 9.8 ms⁻²)”
“31. A proton placed in uniform electric field of 5000 NC⁻¹ directed to right is allowed to go a distance of 10 cm from A to B. Calculate:
(a) Potential difference between the two points
(b) Work done
(c) The change in Potential Energy of the proton
(d) The change in Kinetic Energy of the proton
(e) Its velocity (mass of proton is 67 x 10²⁷ kg)”
32. Using zero reference point at infinity, determine the amount by which a point charge of 4 x 10⁻⁸ C alters the electric potential at point 2m away, when (a) charge is positive (b) charge is negative
“33. In Bohr’s atomic model of hydrogen atom, the electron is in an orbit around the nuclear proton at a distance of 5.29 x 10⁻¹¹ m with a speed of 2.18 x 10⁶ ms⁻¹. Find
(a) The electric potential that a proton exerts at this distance.
(b) Total energy of the atom in eV.
(c) The ionization energy for the atom in eV.”
34. The electrostatic flash attachment for a camera contains a capacitor for storing energy used to produce the flash. In one such unit, the potential difference between the plates of a 750 micro Farad capacitor is 330 Volt. Determine the energy that is used to produce the flash.
35. A capacitor has a capacitance of 2.5x 10⁻⁸ Farad. In the changing process, electrons removed from one plate and placed on the other one. When the potential difference between the plates is 450 volt, how many electrons have been transferred? (e = 60 x 10⁻¹⁹ Coulomb)

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