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An inductor coil stores 64 J of magnetic field energy and dissipates energy at the rate of 640 W when a current of 8A is passed through it. If this coil is joined across an ideal battery, find the time constant of the circuit in seconds:

(1) 0.4

(2) 0.8

(3) 0.125

(4) 0.2
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Correct Answer is 0.2 

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