1.

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

Answer»

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




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