EASY

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In charging by induction how come the force of attraction overcomes the repulsive force between them?

Important Questions on Electric Charges and Fields

HARD

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Two isolated conducting spheres

S_{1}

and

S_{2}

of radius

\frac{2}{3} R

and

\frac{1}{3} R

have

12 μ C

and

- 3 μ C

charges, respectively, and are at a large distance from each other, They are now connected by a conducting wire. A long time after this is done the charges on

S_{1}

and

S_{2}

are respectively:

EASY

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Two identical conducting spheres A and B carry equal charge. They are initially separated by a distance much larger than their diameters and the force between them is F. A third identical conducting sphere C is uncharged. Sphere C is first touched to A, then to C and removed. As a result, the force between A and B now is

MEDIUM

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

The diagram shows an earthed conducting sphere held close to a positively charged dome.

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What is the charge and potential of the conducting sphere?

EASY

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. The net charge on the sphere is then

MEDIUM

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Explain the charging by conduction in terms of movement of electrons.

EASY

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Assertion: If there exists coulomb attraction between two bodies both of them may not be charged.

Reason: In coulomb attraction two bodies are oppositely charged.

MEDIUM

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

A metal rod A is to be charged positively by using another charged rod B. What should be the kind of charge on rod B if charging is to be done by conduction?

MEDIUM

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

A neutral metallic sphere is placed near a negative point charge (outside the sphere). The net charge on sphere, then

Question Image

EASY

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

When a plastic refill is rubbed with polythene, it acquires a small ___________ charge.

EASY

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Figure below shows a metal rod AB placed on an insulating stand. In figure (a) a negatively charged ebonite rod C is touched with the metal rod AB, while in figure (b), the negatively charged ebonite rod C is held near the rod AB. State the kind of charges at the ends A and B of the rod, in each case.
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MEDIUM

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Explain the charging by induction in terms of movement of electrons.

MEDIUM

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

State two ways of charging a conductor.

HARD

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Suppose there are two copper spheres

A

and

B

having identical sizes. The distance between the centers of sphere is

50 cm

and the charge on each sphere is

6.5 \times 10^{- 7} C

. A third sphere of the same size but uncharged is brought in contact with the first, then brought in contact with the second, and finally removed from both. What is the new force of repulsion between

A

and

B

MEDIUM

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Name the way of charging a conductor in which the charge is shared.

EASY

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Assertion: If a point charge q is placed in front of an infinite grounded conducting plane surface, the point charge will experience a force.

Reason: This force is due to the induced charge on the conducting surface which is at zero potential.

EASY

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

An electrical charge can be transferred from a charged object to another through a ________________.

EASY

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Name two substances which can be charged by friction.

MEDIUM

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

Describe the method of charging a conductor by induction.

EASY

Physics>Electricity and Magnetism>Electric Charges and Fields>Different Methods of Charging

When a charged glass rod is brought near a charged plastic straw rubbed with polythene