A coil of inductance 2 H having negligible resistance is connected to a source of supply whose voltage is given by V = 3t volt (where t is in second). If the voltage is applied when t = 0, then the energy stored in the coil after 4 s is J.

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144. V=L(dI)/(dt)⇒3t=2(dI)/(dt), so I=(3t²)/4. At t=4 s, I=12 A. U=1/2LI²=1/2×2×144=144 J.

A coil of inductance 2 H having negligible resistance is connected to a source of supply whose voltage is given by V = 3t volt (where t is in second). If the voltage is applied when t = 0, then the energy stored in the coil after 4 s is _____ J.

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