The collector plate in an experiment on photo electric 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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a
The photo current will increase
b
The K.E. of the photo electron will decrease
c
The stopping potential will increase
d
The threshold wave length increases
answer is C.
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Detailed Solution
The stopping potential will increaseDue to electric field charge acceleratesMagnetic field moves the charge in circular path