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 to be sensitive if fall of potential per unit length, i.e., potential gradient `(dV//dl)` is small. For given length, l, `V_(y) lt V_(x)` `:. ((dV)/(dl))_(y) lt ((dV)/(dl))_(x)` Therefore, potentiometer Y will be preferref for comparing emfs of the two cells
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