Sensitivity of potentiometer can be increased by

increasing the e.m.f. of the cell.

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increasing the length of the potentiometer.

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decreasing the length of the potentiometer wire.

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none of these.

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Solution

The correct option is B increasing the length of the potentiometer.
The sensitivity of the potentiometer depends upon the value of potential gradient K. (K=Potential supplied by main battery divided by length of wire) Smaller the value of K, smaller the potential difference that a potentiometer can measure and more is the sensitivity of the potentiometer. Thus, for a given potential difference, the sensitivity of the potentiometer increases with the increase in length of potentiometer wire.

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Similar questions

Q. The sensitivity of a potentiometer can be increased by
a) increasing the series resistance in the primary circuit
b) decreasing the length of the potentiometer wire
c) using a thin and high resistivity wire as a potentiometer wire
d) increasing the length of the wire

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