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A coil of inductance 8.4xx10^(-3) H and ...

A coil of inductance `8.4xx10^(-3)` H and a resistance of 6 `Omega` are connected to a 12 V battery as shown in the figure . Switch is closed at t=0 . At what time is the magnetic energy in the coil `4.2xx10^(-3)` Joule ?

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