Current Electricity — Physics STD 12 Science — Question

(2) On decreasing the current through the potentiometer wire, the potential gradient along the wire will decrease. Hence, the position of zero deflection will occur at a longer length.

[Note : In the usual notation,
$
E _1=\left.\left(\frac{I R}{L}\right)\right|_1=\text { constant }
$
Hence, (i) $E$, decreases when $I$ is increased (ii) $I_1$ increases when $I$ is decreased.]