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3.Current Electricity
easy
$STATEMENT-1$ In a Meter Bridge experiment, null point for an unknown resistance is measured. Now, the unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance. and
$STATEMENT-2$ Resistance of a metal increases with increase in temperature.
A
$STATEMENT-1$ is True, $STATEMENT-2$ is True; $STATEMENT-2$ is a correct explanation for $STATEMENT-1$
B
$STATEMENT-1$ is True, $STATEMENT-2$ is True; $STATEMENT-2$ is $NOT$ a correct explanation for $STATEMENT-1$
C
$STATEMENT - 1$ is True, $STATEMENT-2$ is False
D
$STATEMENT -1$ is False, $STATEMENT-2$ is True
(IIT-2008)
Solution
$\mathrm{R}_{\text {mlnown }}=\frac{\mathrm{R}(100-\ell)}{\ell}$
Standard 12
Physics
