Question 535: Current Electricity

Question

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

Accepted Answer

For a Metre bridge,
$\frac{\mathrm{X}}{\mathrm{R}}=\frac{l_{\mathrm{X}}}{l_{\mathrm{R}}}$
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.
$	herefore \quad$ The new position will remain at $(100-l)$.

Answer

$(100-l)$

Answer

$(100-2 l)$

Answer

$(100-3 l)$

Answer

$\left(100-\frac{l}{2}\right)$

Current Electricity

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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