Why area of cross section gets doubled when wire is doubled
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when length of the wire is doubled, the resistance also get doubled, as both are directly proportional. Now, the relation between the new and old resistance is.. Resistance of a wire is directly proportional to length of the wire and inversely proportional to cross sectional area of the wire.
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As a wire gets longer its resistance increases, and as it gets thinner its resistance also increases because itscross sectional area decreases.Doubling the length will double the resistance, but the wire also must getthinner as it is stretched, because it will contain the same amount of metal in twice the length
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