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When a potential difference of 2 V is ap...

When a potential difference of `2 V` is applied across the ends of a wire of `5 m` length, a current of `1 A` is found to flow through it. Calculate
(i) the resistance per unit length of the wire,
(ii) the resistance of `2 m` length of the wire.
(iii) the resistance across the ends of the wire if it doubled on itself.

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