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Engineering Entrance Exams

A wire of resistance 5 ? is drawn out so that its new length is 3 times its original length.What is the reistance of the new wire? (A) 45 ? (B) 15 ? (C) 5/3 ? (D) 5 ?

Profile image of aniket anand
12 Years agoGrade
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2 Answers

Profile image of Saurabh Koranglekar
6 Years ago
Dear student

The volume is constant ie l*area = l` * area`

R = rho*l/a

Regards
Profile image of Vikas TU
6 Years ago
5x3=15 ohm —- and better to measure it resistance by multimeter to be sure...................................

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