Q.

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

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a

60W

b

100W

c

40W

d

All use the same length

answer is C.

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P=V2R=V2Aρl⇒Pα1l
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Three electric bulbs of 40W, 60W and 100W have the tungsten wire of the same diameter. Then the longer wire is used by