In potentiometer experiment, null point isobtained at a particular point for a cell on potentiometer wire x cm long. If the lengthof the potentiometer wire is increasedwithout changing the cell, the balancing length will (Driving source is not changed)

Options

A. increase
B. decrease
C. not change
D. become zero

Answer

A

Explanation

According to question, the functioning of potentiometer can be understood by the following diagram.

Balancing length x is given by
`(x)/(L)=(V)/(V_(0))rArr x=(V xx L)/(V_(0))`
where, V = potential to be measured
`V_(0)` = potential across potentiometer wire
L = length of the potentiometer wire
Since, `x prop L`
So, if length of potentiometer wire is increased without changing the cell, the balancing length also increases.