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Question

James combs his hair and brings the comb near some tiny pieces of paper. He finds that the comb is attracting the pieces of paper. The force of attraction on the tiny piece of paper by the comb is due to which one of the following forces?


  1. Magnetic force

  2. Gravitational force

  3. Nuclear force

  4. Electrostatic force


Solution

The correct option is D

Electrostatic force


When James combs his hair, the comb gets charged as a result of its friction with his hair. It acquires a negative charge.

The bits of paper are electrically neutral. Also, the paper is not a conductor, that is, the charges within it are not free to move about as a current. But when the rod is brought close to the pieces, the negative charges have enough mobility that they are repelled by the rod. So the negative charges of the part paper closest to rod tend to move away from the negatively charged rod. This leaves a net positive charge on parts of the paper bits nearest to the rod and the rod attracts the paper bits, which fly up and stick to the rod. 

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