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Q.

Assertion (A): In a Meter Bridge experiment, null point for an unknown resistance made of metal 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 in the other gap.
Reason (R) : Resistance of a metal increases with increase in temperature.
In the light of the above statements, choose the most appropriate answer from the options given below:

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a

(A) is true but (R) is false

b

(A) is false but (R) is true   

c

Both (A) and (R) are true and (R) is the correct explanation of (A)

d

Both (A) and (R) are true and (R) is NOT the correct explanation of (A)

answer is D.

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Detailed Solution

With increase in temperature, resistance of metal wire increases, but balance conduction will not change.

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Assertion (A): In a Meter Bridge experiment, null point for an unknown resistance made of metal 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 in the other gap.Reason (R) : Resistance of a metal increases with increase in temperature.In the light of the above statements, choose the most appropriate answer from the options given below: