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(B) In the photoelectric effect,electrons are emitted from the emitter plate and move towards the collector plate.When an electric field is applied in

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The kinetic energy of the electrons will increase.

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(B) In the photoelectric effect,electrons are emitted from the emitter plate and move towards the collector plate.When an electric field is applied in the vertically downward direction,the electrons (being negatively charged) experience an electrostatic force in the upward direction (opposite to the electric field).Since the collector plate is placed vertically above the emitter plate,this upward force acts in the direction of the motion of the electrons.As a result,the electrons are accelerated,which increases their kinetic energy upon reaching the collector plate.Because the kinetic energy of the emitted electrons increases,a higher retarding potential (stopping potential) is required to stop them.Therefore,the stopping potential increases,while the saturation photocurrent and the threshold wavelength remain unchanged.

The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate. $A$ light source is turned on and a saturation photocurrent is recorded. An electric field is then switched on which has a vertically downward direction.

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