Fig. shows a potentiometer circuit to determinethe unknown e.m.f. E. When the jockey makes contact at point A, the deflection is towards left. On moving the jockey from A to B, the deflection always remains towards left but goes on decreasing. This means that

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the unknown e.m.f. is wrongly connected

the main potentiometer battery is wrongly connected

the unknown e.m.f. is less than the battery e.m.f.

the unknown e.m.f. is great$ than the battery e.m.f

answer is D.

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Detailed Solution

The unknown e.m.f. is greater than the battery e.m.f.

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