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The potentiometer consists of a wire of ...

The potentiometer consists of a wire of length 4 m and resistance of `10Omega`. It is connected to a cell of e.m.f. 2 V. The potential difference per unti length of the wire will be

A

`0.5 Vm^-1`

B

`2 Vm^-1`

C

`5 V m^-1`

D

`10 Vm^-1`

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