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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 RightarrowX=(VxxL)/V_0`
where, V =potential to be measured
`V_0` = potential difference 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 will 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 –

    A
    increase
    B
    remain unchanged
    C
    decrease
    D
    uncertain

  • A potentiometer wire of length 10 m is connected in series with a battery the emf of a cell balances against 250 cm length of wire if length of potentiometer wire is increased by 1 m then new balancing length of wire will be

    A
    2.00 m
    B
    2.25 m
    C
    2.50 m
    D
    2.75 m

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