NEET Physics Current Electricity Questions Solved

Assertion (A): In a meter bridge experiment null point for an 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 increasing the value of the standard resistance. 
Reason (R): Resistance of metal increases with increase in temperature.
1. If both Assertion and Reason are true and Reason  is correct explanation of Assertion.
2. If both Assertion and Reason are true but Reason  is not the correct explanation of Assertion.
3. If Assertion is true but Reason is false.
4. If both Assertion and Reason are false.

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