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A given wire of resistance 1 Ω is stretched to double its length. What will be its new resistance?

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A given wire of resistance 1 Ω is stretched to double its length. What will be its new resistance?

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Let ‘I’ be the length and ‘a’ be the area of cross – section of the resistor with resistance, R = 1Ω when the wire is stretched to double its length, the new length I’ = 2I and the new area of cross section,

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