**Short Questions**

A strong electric field exists in the vicinity of the “Faraday cage”. Yet the person inside the cage is not affected. Can you tell why? |

An electrified rod attracts pieces of paper . After a while these pieces fly away! Why? |

Are the electric field lines physical entities? |

Capacitor blocks D.C. current but allows A.C. current to pass through a circuit. How does this happen? |

Define electric field intensity? |

Define potential difference between two points. |

Defined farad. |

Describe the method of charging bodies by electrostatic induction. |

Discuss different types of capacitors. |

Discuss one application of static electricity. |

Does each capacitor carry equal charge in series combination? Explain. |

Each capacitor in parallel combination has equal potential difference between its two plates. Justify the statement. |

Enlist some uses of capacitors. |

Explain why, a glass rod can be charged by rubbing when held by hand but an iron rod cannot be charged by rubbing, if held by hand? |

How much negative charge has been removed from a positively charged electroscope, if it has a charge of 7.5 × 10⁻¹¹ C? |

How capacitor store energy? |

How does capacitor store charge? |

How does electrostatic induction differ from charging by friction? |

How electric charge is produced in bodies by friction? |

How would you Define potential difference between two points? Define its unit. |

If a high-voltage power line fell across your car while you were in the car, why should you not come out of the car? |

If two same charges are separated by 1 m distance having 9 × 10⁹ N. Then relate this force with gravitational force? |

In what direction will a positively charged particle move in an electric field? |

In which direction Coulomb’s force act between the two charges? |

Is electric intensity a vector quantity? What will be its direction? |

Is the equivalent capacitance of parallel capacitors larger or smaller than the capacitance of any individual capacitor in the combination? |

Is the equivalent capacitance of series capacitors larger or smaller than the capacitance of any individual capacitor in the combination? |

Is the presence of charge necessary for the existence of electrostatic potential? |

On which factors the value of K depends? |

Perhaps you have seen a gasoline truck trailing a metal chain beneath it. What purpose does the chain serve? |

Show variation of magnitude of Coulomb force between two opposite charges of different magnitude? |

State the Coulomb’s law. |

Suppose two spheres are positively charged. If charge on one of the sphere is doubled then what will be the electrostatic force of attraction between them and what will be the nature of the force? |

What is difference between variable and fixed type capacitor? |

What is meant by electric field and electric intensity? |

What are hazards of static electricity? |

What are the applications of electrostatic induction? |

What are the factors on which the capacitance of a capacitor depends? |

What is direction of electric intensity? |

What is electron volt? Also find its energy in جولs. |

What is meant by capacitance? |

What is meant by electric potential? |

What is meant by electrostatic induction, for which purpose it is used? |

What is parallel combination of capacitor? |

What is series combination of capacitor? |

What is the difference between electric potential and electric potential energy? |

What is the relation between equivalent capacitance of parallel combination and individual capacitance of each capacitor in this combination? |

What is the relation between equivalent capacitance of series combination and individual capacitance of each capacitor in this combination? |

What is the SI unit of charge? |

What is the working principle of capacitor? |

What will happen to Coulomb’s force, if the distance between two point charges becomes double? |

Where electrostatic induction is used? |

Why charge cannot be stored on capacitor for a long time? |

With the help of electroscope how you can find presence of charge on a body. |

**Long Questions**

A capacitor holds 0.03 coulombs of charge when fully charged by a 6 volt battery. How much voltage would be required for it to hold 2 coulombs of charge? |

A capacitor holds 0.06 coulombs of charge when fully charged by a 9 volt battery. Calculate capacitance of the capacitor . |

A point charge of +2 C is transferred from a point at potential 100 V to a point at potential 50 V. What would be the energy supplied by the charge? |

Define an electric charge. How electric charge can be produced? |

Define electrostatic induction. Write the method of charging bodies by electrostatic induction? |

Define potential difference between two points. Show that potential difference can be described as energy transfer per unit charge between the two points. |

Derive the formula for the equivalent capacitance for a series combination of a number of capacitors. |

Derive a formula for effective capacitance for parallel combination of a number of capacitors? |

Derive a formula for effective capacitance for series combination of a number of capacitors? |

Describe capacitor as an energy storing device. What do you mean by capacitance of a capacitor? Define units of capacitance. |

Describe how you would determine the nature of the charge on a body by using electroscope. |

Discuss different types of capacitors. |

Discuss the applications of electrostatics |

Explain Coulomb’s law of electrostatics and write its mathematical form. |

How can you show by simple experiments that there are two types of electric charges? |

How an electroscope be charged by electrostatic induction and conduction as well? |

Show that potential difference can be described as energy transfer per unit charge between the two points. |

State coulomb’s law. Derive the expression of electrostatic force |

Suppose you have a glass rod which becomes positively charged when you rub it with wool. Describe how would you charge the electroscope (i) negatively (ii) positively. |

The charge of how many negatively charged particles would be equal to 100 µC. Assume charge on one negative particle is 1.6 × 10⁻¹⁹ C ? |

The electric potential at a point in an electric field is 10⁴ V. If a charge of +100 µC is brought from infinity to this point. What would be the amount of work done on it? |

The force of repulsion between two identical positive charges is 0.8 N, when the charges are 0.1 m apart. Find the value of each charge. |

Two capacitors of capacitances 6 µF and 12 µF are connected in parallel with a 12 V battery. Find the equivalent capacitance of the combination. Find the charge and the potential difference across each capacitor . |

Two capacitors of capacitances 6 µF and 12 µF are connected in series with 12 V battery. Find the equivalent capacitance of the combination. Find the charge and the potential difference across each capacitor . |

Two charges repel each other with a force of 0.1 N when they are 5 cm apart. Find the forces between the same charges when they are 2 cm apart. |

Two point charges q1 = 10 µC and q2 = 5 µC are placed at a distance of 150 cm. What will be the Coulomb’s force between them? Also find the direction of the force. |

What is gold leaf electroscope? Discuss its working principle with a labelled diagram. |

What are electric field lines? How field lines are related to the electric field intensity? |

What are hazards of static electricity. |

What do you mean by the capacitance of a capacitor? Define units of capacitance. |

What is meant by electric field and electric intensity? |

Write in detail the construction and uses of electroscope? |

Write the uses of capacitors. |

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