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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 ?

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 ?

Grade:

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
2 years ago
Dear student

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

R = rho*l/a

Regards
Vikas TU
14149 Points
2 years ago
5x3=15 ohm —- and better to measure it resistance by multimeter to be sure...................................

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