Circuit for the measurement of resistance by potentiometer is shown. The galvanometer is first connected at point $A$ and zero deflection is observed at length $P J = 10\ cm$ . In second case it is connected at point $C$ and zero deflection is observed at a length $30\ cm$ from $P$ . Then the unknown resistance $X$ is
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S.No. $R$ $l$ $100-l$ $S = \left( {\frac{{100 - l}}{l}} \right)R$ $1$ $20\,\Omega $ $43$ $57$ $26.51\,\Omega $ $2$ $30\,\Omega $ $51$ $49$ $28.82\,\Omega $ $3$ $40\,\Omega $ $59$ $41$ $27.80\,\Omega $ $4$ $60\,\Omega $ $70$ $30$ $25.71\,\Omega $