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A solenoid of resistance 50 Omega and in...

A solenoid of resistance `50 Omega` and inductance 80 H is connected to a 200 V battery, How long will it take for the current to reach 50% of its final equlibrium value ? Calculate the maximum enargy stored ?

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The correct Answer is:
`(L//R) In 2=1.109s, 640J`
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