Answer:
The possible faults are as follows : (i) The positive terminal of the cell E that of unknown emf is not connected at A. (ii) The emf of the cell of unknown emf E is greater than the emf of driver cell. If the deflection at the end B is (a) more than A, then fault (i) would be there as driving cell unknown emf E equivalent to series combination of cells. (b) Less than A, then fault (ii) would be there as two cells in series opposing each other and hence deflection at end B is less.
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