A copper wire of length has a resistance of

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

A copper wire of length

2\,\text{m}

has a resistance of

5\,\Omega

. It is stretched uniformly so that its length becomes

2.5\,\text{m}

, with no change in volume. What is the new resistance of the wire? (a)

9.8\,\Omega

(b)

7.8\,\Omega

(c)

12.5\,\Omega

(d)

6.3\,\Omega

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