The potentiometer wire $AB$ is $600\,\, cm$ long at what distance from $A$ should the Jockey $J$ touch the wire to get zero deflection in the galvanomenter ................ $\mathrm{cm}$
Medium
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$\mathrm{x} \ell_{1}=\frac{\mathrm{E}}{2}$
$\Rightarrow \frac{V_{A B}}{L} \ell_{1}=\frac{E}{2}$
$\Rightarrow \frac{\left(\frac{15 r}{16 r}\right) E}{6} \ell_{1}=\frac{E}{2}$
$\ell_{1}=3.2 \mathrm{\,m}$
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