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A cell of negligible internal resistance is connected to a potentiometer wire and potential gradient is found. Keeping the length as constant, if the radius of potentiometer wire is increased four times, the potential gradient will become (no series resistance in primary)

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4 times

2 times

half

constant

answer is D.

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Detailed Solution

Potential Gradient K = V/L

K is independent of the area of the cross-section and if the length is kept constant, the potential gradient also stays constant.

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