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 metal increases with increase in temperature.

Options

A. both assertion and reason are true and the reason is Assertion and Reason explanation of the Assertion
B. both assertion and reason are true and the reason is Assertion and the correct explanation of the Assertion
C. Assertion is true , but the reason is false
D. both assertion and reason are false

Answer

d

Explanation

Here both Assertion and Reason are wrong. We know that with the increase in temperature , the value of unknown resistance of conductor increase in balanced neter bridge `(R )/(X) = (l_(1))/(l_(2))`
Where `R` is standard known resistance and `X` is unknown resistance On heating as `X` increase so for the same value of `l_(1)l_(2) R` should be increased and not decrease