Which of the following cannot be charged easily by friction?
$(a)$. A plastic scale
$(b)$. A copper rod
$(c)$. An inflated balloon
$(d)$. A woollen cloth

AcademicPhysicsNCERTClass 8

The correct answer is: $(b)$. A copper rod

Explanation:

Only those materials which are not good conductors$(bad\ conductors\ or\ insulators)$ of electricity can be charged by friction.

We have to find out the item that cannot be charged easily by friction among the four items-

a plastic scale, a copper rod, an inflated balloon, and woolen cloth.

Let us check which one is a good conductor or bad conductor of electricity.

A plastic scale-

A plastic plate is a bad conductor of electricity.

A copper rod-

A copper rod is a good conductor of electricity.

An inflated balloon-

An inflated balloon is a bad conductor of electricity.

A woolen cloth-

Woolen cloth is a bad conductor of electricity.

Only a copper rod is a good conductor of electricity among the given four items. So, a copper rod cannot be charged easily by friction.

Therefore, option $(b)$ is correct.

raja
Updated on 10-Oct-2022 13:25:09

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