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Question

An inflated balloon is rubbed with a woollen cloth and in another case, a ballpen refill is rubbed with polythene. When the balloon and refill are brought closer, it is observed that they attract each other. What can we understand by this?


A
Both of them are not charged.
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B

They acquired the opposite kind of charges.

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C

One of the object is not charged.

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D

Both acquired the same kind of charge.

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Solution

The correct option is B

They acquired the opposite kind of charges.


When you rub one material to another, they are charged by friction, also like charges repel and unlike charges attract each other. In the above experiment, the balloon has acquired a kind of charge that is opposite to the charge acquired by the ballpen refill. As unlike charges attract each other, the balloon and the refill developed a force of attraction with each other, so they acquired opposite kind of charges.


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