In 'A', a plastic comb is held near a very thin stream of water. In 'B', the same comb, after being used to comb hair, is kept exactly in the same position.
Figure

(a) What happens to the water in 'B'?
(b) What is different about the comb in 'B'?
(c) What has caused the comb to change?
(d) Why did the stream get deflected in 'B'?
(e) If you use a glass rod instead of a comb, what will be the effect?

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Solution

(a) It gets attracted towards the comb.

(b) The comb in 'B' is charged.

(c) On being used for combing hair, the comb acquires static electricity.

(d) The stream of water gets deflected in 'B' because it is attracted towards the comb owing to induction.
(e) The effect will be the same, because a glass rod is also an insulator like a plastic comb.

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