A copper wire long has a resistance of

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

Problem

A copper wire

2\,\text{m}

long has a resistance of

1.0\,\Omega

. It is drawn out uniformly until its length becomes

3\,\text{m}

, the temperature remaining unchanged. What is its new resistance? (a)

3.0\,\Omega

(b)

2.25\,\Omega

(c)

1.5\,\Omega

(d)

4.5\,\Omega

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