A coil of 40 mH is crossed by a current of 2 A. The coil is connected to a resistance of 25 while the current is falling. (a) What is the time constant t of the circuit? (b) What is the current in the coil after a time of 1.6 ms? (c) What is the voltage across the resistor after 1.6 ms? (d) What is the voltage across the coil after 1.6 ms?
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