Question

The curve between current and potential difference  for a photocell will be

A
option
B
option
C
option
D
option
Medium

Solution

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Correct option is D)

In photo electric effect, when potential applied is negative current still flows because electrons gaining kinetic energy from the incident light reaches negative terminal. And as the potential applied is positive more electrons
flows towards the positive terminal and current increases. But after some potential, current in the circuit reaches a constant value, called saturation current, and further increase in potential does not changes current value.
So, D option is true.

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