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Question

The diagram of Van de Graff generator is shown. Corona discharge occurs at the :

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A
spray comb
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B
discharge tube
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C
conveyor belt
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D
spherical conductor
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Solution

The correct option is A spray comb
The positive terminal of a high tension source (HT) is connected to the comb B1. Due to the process called action of points, charges are accumulated at the pointed ends of the comb, the field increases and ionizes the air near them. The positive charges in air are repelled and get deposited on the belt due to corona discharge. The charges are carried by the belt upwards as it moves.

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