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While doing an experiment with potentiom...

While doing an experiment with potentiometer (see figure) it was found that the deflection is one sided and (i) the deflection decreased while moving from one and A of the wire, to the end R, (ii) the deflection increased, while the jockey was moved towards the end D.
(a)Which terminal positive and negative of the cell `E_1` is connected at X in case (i) and how is `E_1` related to E ?
(b)Which terminal of the cell `E_1` is connected at X in case (i in a) ?

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