Q .     A cell in secondary circuit gives null deflection for `2.5 m` length of potentiometer
having `10 m` length of wire. If the length of
the potentiometer wire is increased by `1 m` without changing the cell in the primary, the position of the null point now is -

BITSAT 2009
A

`3.5 m`

B

`3 m`

C

`2.75 m`

D

`2.0 m`

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