Question 571: Current Electricity

Question

In a meter bridge experiment null point is obtained at $$l \mathrm{~cm}$$ from the left end. If the meter bridge wire is replaced by a wire of same material but twice the area of across-section, then the null point is obtained at a distance

Accepted Answer

At null condition, $$\frac{R_1}{R_2}=\frac{X}{100-X}$$
This condition is independent of the cross-sectional area of the wire used.
$$	herefore \quad$$ The null point will remain the same. (i.e., $$l \mathrm{~cm}$$ from left end)

Answer

$$2 l \mathrm{~cm}$$ from left end.

Answer

$$l \mathrm{~cm}$$ from left end.

Answer

$$ l / 2 \mathrm{~cm}$$ from left end.

Answer

$$ l / 4 \mathrm{~cm}$$ from left end.

Current Electricity

In a meter bridge experiment null point is obtained at $l \mathrm{~cm}$ from the left end. If the meter bridge wire is replaced by a wire of same material but twice the area of across-section, then the null point is obtained at a distance

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