In meter bridge experiment for measuring unknown resistance ' $S$ ', the null point is obtained at a distance $30 cm$ from the left side as shown at point $D$. If $R$ is $5.6 k \Omega$, then the value of unknown resistance ' $S$ ' will be $\Omega .$
JEE MAIN 2022, Medium
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$\frac{ S }{30}=\frac{5.6 \times 10^{3}}{70}$
$S =\frac{3}{7} \times 5.6 \times 10^{3}=2400$
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