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A potentiometer consists of a wire of le...

A potentiometer consists of a wire of length 4 m and resistance `10 Omega`. If is connected of cell of emf `2V`. The potential difference per unit length of the wire will be

A

`0.5" V"//"m"`

B

`10" V"//"m"`

C

`2" V"//"m"`

D

`5" V"//"m"`

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