A $10\,m$ long potentiometer wire has a potential gradient of $0.0025\, V/cm$. Calculate the distance of null point when the wire is connected to a $1.025\,V$ standard cell ............... $\mathrm{m}$
Medium
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$\mathrm{V}=\mathrm{x} \ell$
$\mathrm{x}=0.0025 \mathrm{\,V} / \mathrm{cm}=0.25 \mathrm{\,V} / \mathrm{m}$
$\ell=\frac{\mathrm{V}}{\mathrm{x}}=\frac{1.025}{0.25}$
$\quad=4.1 \mathrm{\,m}$
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