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Potentiometer wire of length 1 m is conn...

Potentiometer wire of length `1 m` is connected in series with `490 Omega` resistance and `2 V` battery. If `0.2 mV/cm` is the potential gradient, then resistance of the potentiameter wire is approximately

A

`4.9 Omega`

B

`7.9 Omega`

C

`5.9 Omega`

D

`6.9 Omega`

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