The current in a 70.0-mH inductor changes with time as I = 4.00t2- 7.00t, 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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A: Solution:   e) Given that,   B=2.60 T at t=0 dB/dt=0.50 T/s x0=0.100 mV=2.25 m/s

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