In the meter bridge shown, the length $AB$ for which the deflection in galvanometer is zero will be ............. $cm$
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$\frac{\mathrm{R}_{1}}{\mathrm{R}_{2}}=\frac{\ell}{100-\ell}$
$\Rightarrow \frac{15}{10}=\frac{\ell}{100-\ell}$
$\Rightarrow \ell=60 \mathrm{\,cm}$
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