Question

Which of the following charging methods result in charging an object opposite to the charge on the object used to charge it?

• A. charging by friction
• B. charging by contact
• C. charging by induction
• D. both A and C

Answer 1

The correct option is D both A and C

When two electrically neutral objects are rubbed against each other, some of the electrons get transferred from surface of one object to the other and thus the two objects become electrically charged with opposite polarity. This process is known as charging by friction.

When a charge $Q$ is brought near an uncharged conductor, the charge $Q$ induces a charge of opposite polarity on the facing surface of the conductor and the same polarity on the rearer surface. This process of inducing a charge on the conductor is known as induction.

Charging by contact induces charge of same polarity on the neutral conductor.

Thus charging by induction and charging by friction are the two methods which results in charging an object opposite to the charge on the object used to charge it.