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  4. A rigid container with thermally insulated walls contains a coil of resistance 100 Ω, carrying current 1 A. Change in internal energy after 5 min will be

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Q. A rigid container with thermally insulated walls contains a coil of resistance 100 $\Omega$, carrying current 1 A. Change in internal energy after 5 min will be

IIT JEEIIT JEE 2005Current Electricity

Solution:

W = 0. Therefore, from first law of thermodynamics,
$ \, \, \, \, \, \, \Delta U = \Delta Q = i^2Rt$
$ \, \, \, \, \, \, \, \, \, \, = (I)^2 (100) (5 \times 60)J = 30kJ$