A potentiometer experiment setup is shown in the given diagram. R is the point when there is no deflection in the galvanometer. $E_{1}$ is the source. Match the following.
Column-I Column-II
P) If only emf of battery $E_{1}$ is increased (1) point R will shift to left
Q) If only resistance offered by rheostat is increased (2) point R will shift to right
R) If resistance box (RB) is connected and resistance of RB is increased. (3) point R will remain unchanged point R
S) If an identical battery is connected in parallel to E. (4) may shift to left or right

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P-1, Q-2, R- 4, S-4

P-1, Q-2, R-2, S-4

P-2, Q-2, R-4, S-2

P-1, Q-2, R-4, S-2

answer is C.

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	Column-I		Column-II
P)	If only emf of battery $E_{1}$ is increased	(1)	point R will shift to left
Q)	If only resistance offered by rheostat is increased	(2)	point R will shift to right
R)	If resistance box (RB) is connected and resistance of RB is increased.	(3)	point R will remain unchanged point R
S)	If an identical battery is connected in parallel to E.	(4)	may shift to left or right