The battery terminal voltage in Figure P20.43 is ε = 9.00 V and the current I reaches half its maximum value of 2.00 A at t = 0.100 s after the switch is closed. Calculate (a) the time constant τ. (b) what is the emf across the inductor at t = 0.100 s? (c) What is the emf across the inductor in the instant after the switch is closed at t = 0?
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