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A coil having inductance 2.0 H and resi...

A coil having inductance 2.0 H and resistance `20 Omega` is connected to a battery of emf 4.0 V. Find (a) the current a the instant 0.20 s after the connection Is made and (b) the magnetic energy at this instant.

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The correct Answer is:
`(a) (1)/(5)(1-e^(-2))~=0.17A " "(b)(1)/(25)(1-e^(-2))^(2)0.03J`
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