Physics - Error Question with Solution | TestHub

In the experimental set up of metre bridge shown in the figure, the null point is obtaine data distance of $40\mathrm{cm}$ from A. If a $10\Omega$ resistor is connected in series with ${\mathrm{R}}_1,$ the null point shifts by $10\mathrm{cm}$. The resistance that should be connected in parallel with $\left({\mathrm{R}}_1+10\right)\Omega$ such that the null point shifts back to its initial position is