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Questions  

In laboratory, a potentiometer is generally used

a
to determine the resistivity of a given wire
b
to compare the emfs of two primary cells
c
to determine the internal resistance of a cell
d
both (2) & (3)

detailed solution

Correct option is D

A potentiometer is a device which is used to determine the internal resistance of a cell as well as to compare the emfs of two primary cells.

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In an experiment with potentiometer to measure the internal resistance of a cell, when the cell is shunted by 5Ω , the null point is obtained at2m . when cell is shunted by 20Ω  the null point is obtained at3m .The internal resistance of cell is


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