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  4. A coil having inductance L and resistance R is connected to a battery of emf ϵ at t=0 . If t1 and t2 are the times for 90 % and 99 % completion of the current growth in the circuit, then (t1/t2) will be

Q. A coil having inductance and resistance is connected to a battery of emf at . If and are the times for and completion of the current growth in the circuit, then will be

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Solution:





............(1)
and

..............(2)
From equations (1) and (2), we have

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