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In meter bridge experiment, null point was obtained at a distance ' $l$ ' from left end. The values of resistances in the left and right gap are doubled and then interchanged. The new position of the null point is
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The correct answer is:
$(100-l)$
$\begin{aligned}
& \text { For a Metre bridge, } \\
& \frac{\mathrm{X}}{\mathrm{R}}=\frac{l_{\mathrm{X}}}{l_{\mathrm{R}}}
\end{aligned}$
After doubling and interchanging the left and right gap resistances, the ratio of the resistances do not change.
This means the null point does not change.
$\therefore \quad$ The new position will remain at $(100-l)$.
& \text { For a Metre bridge, } \\
& \frac{\mathrm{X}}{\mathrm{R}}=\frac{l_{\mathrm{X}}}{l_{\mathrm{R}}}
\end{aligned}$
After doubling and interchanging the left and right gap resistances, the ratio of the resistances do not change.
This means the null point does not change.
$\therefore \quad$ The new position will remain at $(100-l)$.
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