how does resistance of the wire vary with the area of this cross section
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Electrical resistance is directly proportional to the length (L) of the conductor and inversely proportional to the cross-sectional area (A). ... Resistance is inversely proportional to the area of cross-section. When the area of cross-section increases the resistance decreases and vice versa
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Corrosion is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, carbonate or sulfide. It is the gradual destruction of materials by chemical and/or electrochemical reaction with their environment.
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ok bye I don't know the answer sorry
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