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A battery of e.m.f. 2 V and internal res...

A battery of e.m.f. 2 V and internal resistance `2Omega` is connected to an external resistance `8Omega`. If the length of the conductor is 4 m, then potential gradient between the two ends of the wire is

A

`0.4" V"//"m"`

B

`8" V"//"m"`

C

`4" V"//"m"`

D

`2" V"//"m"`

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