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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.