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Potentiometer

Draw a labell...

Question

Draw a labelled circuit diagram of a potentiometer to measure internal resistance of a cell. Write the working formula. (Derivation not required).

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Solution

Working Formula: $r = R (\begin{matrix} \frac{l_{1}}{l_{2}} - 1 \end{matrix})$
where, the null deflection of galvanometer comes for first cell at a length of $l_{1}$ on the scale and the null deflection of galvanometer comes for the second cell at a length of $l_{2}$ on the scale

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