In potentiometer experiment, null point is obtained at a particul… - Vidyadip

MCQ

In potentiometer experiment, null point is obtained at a particular point for a cell on potentiometer wire $x cm$ long. If the length of the potentiometer wire is increased without changing the cell, the balancing length will (Driving source is not changed)

✓
increase
B
decrease
C
not change
D
becomes zero

✓

Answer

Correct option: A.

increase

(a) : When the length of potentiometer wire is increased without changing the cell, its potential gradient decreases.
As, $E=K l$
For the same cell, if potential gradient $(K)$ decreases, balancing length $(l)$ increases.

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