The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate. Light source is put on and a saturation photo current is recorded. Parallel electric and magnetic fields are applied vertically downwards between the plates. Then

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the K.E. of the photo electron will decrease

the threshold wave length increases

the photo current will increase

the stopping potential will increase

answer is C.

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Detailed Solution

When electrons are moving up an electric field in the downward direction will accelerate the electron in upward direction so its kinetic energy increases hence stopping potential increases.

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