Q. 2

A coil of resistance 100 Ω is connected across a battery of emf 6.0V. Assume that the heat developed in the coil is used to raise its temperature. If the heat capacity of the coil is 4.0 J K–1, how long will it take to raise the temperature of the coil by 15°C.

Answer :


Given-



Resistance of the coil, R = 100 Ω,
Emf of the battery, V = 6 V,
Change in temperature, ∆T = 15°C



Using Joule’s heating effect heat produced across the coil,



This heat generated is used to increase the temperature of the coil.








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