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Assertion: A potentiometer of longer len...

Assertion: A potentiometer of longer length is used for accurate measurement
Reason: The potential gradient for a potentiometer of longer length with a given source of e.m.f becomes small

A

If both assertion and reason are true and reason is correct explanation of assertion

B

If both assertion and reason are true but reason is not correct explanation of assertion

C

If assertion is true but reason is false

D

If assertion is false but reason is true

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A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery used across the potentiometer wire, has an emf of 2V and negligible internal resistance. The potentiometer itself is 4m long. When the resistance 'R_(1)' , connected across the given cell has values of (i) infinity (ii) 9.5Omega , the balancing length on the potentiometer wire are found to be 3m and 2.85m respectively. The value of internal resistance of the cell is