Answer
$\frac{di_2}{dt} = 0$
Work Step by Step
After a long time, the inductor acts like an ordinary wire, so there is no change in the current that passes through $R_2$
Therefore:
$\frac{di_2}{dt} = 0$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 30 - Induction and Inductance - Problems - Page 901: 79l
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