A source of light is placed at a distanc...

A source of light is placed at a distance of 1 m from a photo cell and the cut off potential is `V_0`. If the source of light is placed at a distance of 50 cm, the cut off potential will be :

A

`V_0`

B

`2V_0`

C

`4V_0`

D

`16V_0`

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