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A coil having resistance 20Omega and ind...

A coil having resistance `20Omega` and inductance `2 H` is connected to a battery of `emf 4.0 V`.Find (a)the current at `0.20 s` after the connections is made and (b)the magnetic field energy in the coil at this instant.

Text Solution

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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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