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In potentiometer experiment, null point ...

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)

A

increase

B

decrease

C

not change

D

become zero

Text Solution

Verified by Experts

The correct Answer is:
A
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.
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Knowledge Check

  • If the length of potentiometer wire is increased, then the accuracy in the determination of null point

    A
    decreases
    B
    increases
    C
    remains unaffected
    D
    none of these

  • If the length of the potentiometer wire is doubled, the sensitivity for obtaining null point will –

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    uncertain

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    A
    2.00 m
    B
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    C
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    D
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