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. [2008]

Question

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.

STATEMENT-2 : Resistance of a metal increases with increase in temperature. [2008]

Smart Achievers · Accepted Answer

(4)

When the temperature of a metal increases, its resistance increases.

$R_{t} = R_{0} (1 + α t)$

For a meter bridge at null point or at balanced condition

$\frac{X}{l} = \frac{S}{100 - l}$ or $\frac{X}{S} = \frac{l}{100 - l}$

For null point $' J'$ at the same point, $\frac{l_{1}}{100 - l_{1}}$ to remain unchanged, $\frac{X}{S}$ should also remain unchanged. Hence, if $X$ is increasing, then standard resistance $S$ should also increase.

Solution

1 Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.

2 Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1.

3 Statement-1 is True, Statement-2 is False

4 Statement-1 is False, Statement-2 is True

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