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1)The current in a 60.0-mH inductor changes with time as i = 4.00t2 − 7.00t, where...

1)The current in a 60.0-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.

(b) Find the magnitude of the induced emf at t = 4.00 s.

(c) At what time is the emf zero?

2)A 499-turn solenoid has a radius of 7.10 mm and an overall length of 15.4 cm.

(a) What is its inductance?

(b) If the solenoid is connected in series with a 2.50-Ω resistor and a battery, what is the time constant of the circuit?

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