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The null point of a potentiometer with a cell of emf $\varepsilon$ is obtained at a distance $l$ on the wire, then
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The correct answer is:
$\varepsilon \propto l$
As we know, electric field, $E=-\frac{d V}{d r}$
Hence, emf $\varepsilon$ is also directly proportional to $l$ i.e., $\varepsilon \propto l$.
Hence, emf $\varepsilon$ is also directly proportional to $l$ i.e., $\varepsilon \propto l$.
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