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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

becomes zero

Text Solution

Verified by Experts

The correct Answer is:
A
`E_(1)=I_(p)l_(1)`
`E_(1)=((E)/(R+r+R_(h)))(R)/(L).l_(1)`
`:.l_(1)=(E_(1)(R+r+R_(h))L)/(ER)`
If L increases then `l_(1)` also increases.
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