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Q.

A potentiometer circuit shown in the figure is set up to measure e.m.f. of a cell E. As the point P moves from X to Y the galvanometer G shows deflection always in one direction, but the deflection decreases continuously until Y is reached. In order to obtain balance point between X and Y it is necessary to 

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a

Reverse the terminals of battery V

b

Decreases the resistance R

c

Increase the resistance R

d

Reverse the terminals of cell E

answer is A.

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Detailed Solution

P.D across the wire must be greater than emf of measuring cell

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A potentiometer circuit shown in the figure is set up to measure e.m.f. of a cell E. As the point P moves from X to Y the galvanometer G shows deflection always in one direction, but the deflection decreases continuously until Y is reached. In order to obtain balance point between X and Y it is necessary to