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A question from Potentiometer (asked in Board Exam)

For the potentiometer circuit shown in the given figure, points X and Y represent the two terminals of an unknown emf E’. A student observed that when the jockey in moved from the end A to the end B of the potentiometer wire, the deflection in the galvanometer remains in the same direction.

What may be the two possible faults in the circuit that could result in this
obsevation ?
If the galvanometer deflection at the end B is (i) more, (ii) less, than that at the end A, which of the two faults, listed above, would be there in the circuit ?
Give reasons in support of your answer in each case.

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