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A commutator is attached to the battery, it is used to

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change the pressure difference inside the tube

reverse the polarity of collector and emitter plates

change the angle of incidence of incident light

change the potential difference between emitter and collector plates

answer is D.

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Detailed Solution

The electrodes cathode and anode are connected to a commutator which is used for changing the direction of the electric current and hence, it reverses the polarity of collector and emitter plates.

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