In the given potentiometer circuit, the resistance of the potentiometer wire AB is R0. C is a cell of internal resistance r. The galvanometer G does not give zero deflection for any position of the jockey J. Which of the following cannot be a reason for this?
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a
r > R0
b
R >> R0
c
Emf of C > Emf of D
d
The negative terminal of C is connected to A
answer is A.
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Detailed Solution
If e.m.f of C is greater than the e.m.f. of D,Ir = 0so r does not play any role of zero deflection in galvanometer.