Question

1. Why does a plastic scale, after being rubbed against dry hair, tends to attract bits of paper?
2. What will be the nature of charge on two bodies A and B that attract each other?
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Answer 1

Answer:

1.) It is because the plastic scale acquires static energy.

2.) One of them will be negatively charged and one of them will be positively charged.

Answer 2

Answer:

1) when plastic comb is rubbed with dry hair , it acquires charge due to static electricity and so it attracts pieces of paper which is uncharged.

2) On the other hand, when the charges on the two bodies are opposite nature. The two bodies will attract each other. It is given that two bodies A and B are kept near each other. The electrostatic force between the two found to be attractive.