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

$\begin {array} {1 1} (A)\;Zero & \quad (B)\;10KJ \\ (C)\;20KJ & \quad (D)\;30KJ \end {array}$

The change in the internal energy$\Delta U = i^2Rt$
on substituting the values we get $\Delta U= 30kJ$
Ans : (D)

edited Sep 10, 2014