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a
Photoelectric current increases with increase in accelerating potential until it becomes maximum value.
b
High voltage spark passed across electrodes in a discharge tube if they are illuminated by ultraviolet light.
c
To study the effect of potential on photoelectric current, we first maintain collector at same positive potential with respect to emitter.
d
The maximum negative potential given to collector for which photoelectric current becomes zero is called stopping potential.
answer is D.
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