Lag1989 problem number 18.28

Lag1989 problem number 18.28

There is a coil with an inductance of L = 0.2 GH and a resistance R = 1.64 Ohm. Find how many times η will decrease the current in the coil in τ = 50 ms after the constant EMF source is turned off and the coil is short-circuited.

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