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The variation of potential difference V ...

The variation of potential difference `V` with length `l` in case of two potentiometers `X` and `Y` is as shows in Fig. `6.21`. Which of these two will you perfer for comparing the emfs of the two cells and why ?

Text Solution

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A potentiometer is said be senitive if fall of potential per unit
length, i.e., potential gradient `(dV//dl)` is small. The slope of `V - I`
graph gives potential gradient, which is smaller for potentiometer
wire `Y` than for potentiometer wire `X`. Therefore, potentiometer
`Y` will be perferred for comparing emfs of the two cells.
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