PDF chapter test TRY NOW
Take a used ballpen refill and rub it vigorously with a piece of polythene. Bring it close to small pieces of paper. Take care not to touch the rubbed end of the refill with your hand or with a metallic object. Repeat the activity with small pieces of dry leaf, husk and mustard seeds. Record your observations.
a. Ball pen refills pick up a tiny electric charge, when they are rubbed with .
b. Small bits of paper are drawn to the ball pen refill when it is brought close to them.
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