"1":"data":"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.","imageType":"-1","image":"-1","2":"data":"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.","imageType":"-1","image":"-1"

Question

"1":"data":"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.","imageType":"-1","image":"-1","2":"data":"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.","imageType":"-1","image":"-1" (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

With increase in temperature, the value of unknown resistance will increase.
In balanced Wheat stone bridge condition,

\frac{R}{X} = \frac{l _{1}}{l _{2}}

Here, R = value of standard resistance.

X = value of unknown resistance.
To take null point at same point or

\frac{l _{1}}{l _{2}}

to remain unchanged,

\frac{R}{X}

should also remain unchanged
Therefore, if X is increasing R, should also increase.

∴

Correct option is (d).