STATEMENT-1: In a Meter Bridge experiment,a n | vedclass

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(D) In a Meter Bridge,the condition for the null point is given by $\frac{R_u}{R_s} = \frac{\ell}{100-\ell}$,where $R_u$ is the unknown resistance,$R_

Vedclass · Accepted Answer

$STATEMENT-1$ is False,$STATEMENT-2$ is True

Vedclass · Answer

(D) In a Meter Bridge,the condition for the null point is given by $\frac{R_u}{R_s} = \frac{\ell}{100-\ell}$,where $R_u$ is the unknown resistance,$R_s$ is the standard resistance,and $\ell$ is the balancing length.When the temperature of the unknown resistance $R_u$ increases,its resistance increases because $R_u(T) = R_0(1 + \alpha \Delta T)$.To keep the null point at the same position $\ell$,the ratio $\frac{R_u}{R_s}$ must remain constant.Since $R_u$ has increased,$R_s$ must also be increased to maintain the same ratio.$STATEMENT-1$ suggests decreasing $R_s$,which is incorrect.$STATEMENT-2$ is a well-known physical fact that the resistance of a metal increases with temperature.Therefore,$STATEMENT-1$ is False and $STATEMENT-2$ is True.

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