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In a potentiometer the null point is rec...

In a potentiometer the null point is received at nth wire. If now we have to change the null poinnt (n+1)th wire, what should we do?

A

Attach resistance in series with battery

B

increase resistance in main circuit

C

decrease resistance in main circuit

D

decrease applied emf

Text Solution

Verified by Experts

The correct Answer is:
B
To shift the balance point on higher length, the potential gradient of the wire is to be decreased. The same can be obtained by decreasing the current of the main circuit, which is possible by increasing the resistance in series of potentiometer wire.
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