In the given potentiometer circuit length of the wire $AB$ is $3\,m$ and resistance is $R=4.5\,\Omega $. The length $AC$ for no deflection in galvanometer is ............... $m$
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Current in wire
$\mathrm{AB} =\frac{5}{5}=1 \mathrm{\,Amp}$
$\mathrm{V}_{\mathrm{A}}-\mathrm{V}_{\mathrm{C}} =1 \times \frac{4.5}{3} \times \ell=3 $
$\ell =2 \mathrm{\,meter}$
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