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 ................ $\mathrm{m}$
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Potential gradient
$\mathrm{x}=\left(\frac{5}{0.5+4.5}\right)\left(\frac{4.5}{3}\right)=1.5 \mathrm{\,Vm}^{-1}$
Here $(\mathrm{x})(\mathrm{AC})=3 \Rightarrow \mathrm{AC}=\frac{3}{1.5}=2 \mathrm{\,m}$
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