A long copper wire of circular cross-section and resistance


A long copper wire of circular cross-section and resistance 0.05 O has a potential difference of 0.10 V applied across its ends. The wire is then melted and reformed into a wire of circular cross-section that is twice as long. When the same potential difference is applied across its ends, what is the new current in the wire?

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Electrical Engineering: A long copper wire of circular cross-section and resistance
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