Wheatstone bridge principle is used to measure the specific resistance $\left(S_1\right)$ of given wire, having length $L$, radius $r$. If $X$ is the resistance of wire, then specific resistance is ; $S_1=X\left(\frac{\pi r^2}{L}\right)$. If the length of the wire gets doubled then the value of specific resistance will be :

[JEE Main 2024, 27 Jan (Shift 2)]

Question

Wheatstone bridge principle is used to measure the specific resistance $\left(S_1\right)$ of given wire, having length $L$, radius $r$. If $X$ is the resistance of wire, then specific resistance is ; $S_1=X\left(\frac{\pi r^2}{L}\right)$. If the length of the wire gets doubled then the value of specific resistance will be :

[JEE Main 2024, 27 Jan (Shift 2)]

YESPYQ · Accepted Answer

Correct answer: c) $S _1$. As specific resistance does not depends on dimension of wire so, it will not change.

Wheatstone bridge principle is used to measure the specific resistance \(\left(S_1\right)\) of given wire, having length…

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