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When the switch is closed at time t=0 ,
The current through the circuit
--------------------(1)
Power loss in Resistance
---------------(2)
Rate at which energy is stored in inductor
---------------(3)
this happens when
potential across the resistance = potential across inductor =
-------------------(4)
from (1) and (4)
t = ln (2)*5x10-3/15) = 0.2311 x 10-3 s = 0.231 ms
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