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Solution: What will its resistance be if it is uniformly stretched so that its length becomes 12 m?

What will its resistance be if it is uniformly stretched so that its length becomes 12 m?

Problem Statement: ECE Board April 1990

The resistance of a wire varies directly with its length and inversely with its area. If a certain piece of wire 10 m long and 0.10 cm in diameter has a resistance of 100 ohms, what will its resistance be if it is uniformly stretched so that its length becomes 12 m?

Problem Answer:

The resistance of the wire will become 144 ohms.

Solution:

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