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A potentiometer wire has length 5m and r...

A potentiometer wire has length `5`m and resistance `100 2`. A rheostat of range `(100 2 - 1 k2)` and accumulator of emf `20` V is connected with potentiometer wire. The maximum potential gradient possible in the wire is

A

4/11' V/m

B

40/11` V/m

C

4' V/m

D

2' V/m

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