The diameter of a wire is reduced to one-third of its initial value while its length…

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

Problem

The diameter of a wire is reduced to one-third of its initial value while its length is kept constant. How does its resistance change? (a) It becomes

3

times the original value (b) It becomes

9

times the original value (c) It becomes

\dfrac{1}{3}

of the original value (d) It becomes

\dfrac{9}{4}

times the original value