If the length of a given wire is doubled and its area of cross section also doubled, then what is the new resistance? What is its new resistivity?
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Explanation:
The resistance of a conductor is directly proportional to its length and inversely proportional to its cross-sectional area. As the wire is stretched to its double length, its cross-sectional area will become half, hence, the resistance of the stretched wire will become 4 times. The resistance R = ρl / a.
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R=rho A by. L. formula section is opening sorry for that
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