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# 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

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.

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