JEE PHYSICS MCQ: CURRENT ELECTRICITY

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Equal amounts of a metal are converted into cylindrical wire of different lengths

L

and cross-sectional area

A

.The wire with the maximum resistance is the one, which has

View answer and explanation

Correct option: C

\mathrm{lengths} = 2L\,\,\mathrm{and }\,\,\mathrm{area} = \frac{A}{2}

Option C (lengths = 2L and area = A/2) is correct because resistance is directly proportional to length and inversely proportional to area, so doubling the length and halving the area maximizes resistance.

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