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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a
the unknown e.m.f. is wrongly connected
b
the main potentiometer battery is wrongly connected
c
the unknown e.m.f. is less than the battery e.m.f.
d
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.