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Q.

Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them separately to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is

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answer is 20.

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Detailed Solution

Qt=V2R

⇒P=V2R⇒P∝1R⇒P1P2=R2R1

Also, R = ρlA=ρl2v

⇒R∝l2

⇒PA5=lB2lA2

⇒PA5=4⇒PA=20W

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