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 ?
aniket anand
12 Years agoGrade
2 Answers
Saurabh Koranglekar
6 Years ago
Dear student
The volume is constant ie l*area = l` * area`
R = rho*l/a
Regards
Vikas TU
6 Years ago
5x3=15 ohm —- and better to measure it resistance by multimeter to be sure...................................
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