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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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