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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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R >> R₀

Emf of C > Emf of D

r > R₀

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,

I_r = 0

so r does not play any role of zero deflection in galvanometer.

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