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Photoelectric current increases with increase in accelerating potential until it becomes maximum value.

High voltage spark passed across electrodes in a discharge tube if they are illuminated by ultraviolet light.

To study the effect of potential on photo-electric current, we first maintain collector at positive potential with respect to emitter.

The maximum negative potential given to collector for which photoelectric current becomes zero is called stopping potential.

answer is D.

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Detailed Solution

The stopping potential is the minimum negative potential applied to collector w.r.t emitter for which photocurrent becomes zero

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