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The current in a 20.0-mH inductor changes with time as i = 2.00t2 – 8.00t, where i is in amperes and t is in seconds.
(a) Find the magnitude of the induced emf at t = 1.00 s.
mv
(b) Find the magnitude of the induced emf at t = 4.00 s.
mv
(c) At what time is the emf zero?

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