Three electric bulbs of 40 W, 60 W and 1...

Three electric bulbs of 40 W, 60 W and 100 W have the tungsten wire of the same diamter. Then the longer wire is used by

A

60 W

B

100 W

C

40 W

D

All use the same length.

Verified by Experts

The correct Answer is:

C

`P=V^(2)/R =(V^(2)A)/(rho l) rArr Palpha 1/l`

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