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A 10 m along uniform metallic wire havin...

A `10` m along uniform metallic wire having a resistance of `20Omega` is used as a potentiometer wire. This wire is connected in series with another resistance of `480 Omega` and a battery of emf `5` V having negligible internal resistance . If an unknown emf e is balanced across `6` m of the potentiometer wire. Calculate :
(i) The potential gradient across the potentiometer wire.
(ii) the value of the unknown emf e.

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