While doing an experiment with potentiometer (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.
(i). Which terminal positive or negative of the cell `E_(1)` is connected at X in case (i) and how is `E_(1)`, related to E?
(ii). Which terminal of the cell `E_(1)` is connected at X in case (1 in 1)?

Explanation

(i) the deflection in galvanometer is one sided and the deflection decreased, while moving from one end 'A' of the wire to the end 'B' Thus imply that current in auxiliary circuit (lower circuit containing primary cell) decreases, while potential difference across A and jockey increases.
This is possible only when positive terminal to the cell `E_(1)`, is connected at X and `E_(1) gt E`.
(ii). The deflection in galvanometer is one sided and the deflection increased, while moving from one end A of the wire to the end B, this imply that current in auxiliary circuit (lower circuit containing primary cell) increases, while potential difference across A and jockey increases.
This is possible only when negative terminal of the cell `E_1`, is connected at X.