The current in an inductor L = 250 mH varies according to I = 3.8 sin(80t) A. Find: a) the induced emf at t = 3.6 ms: 75.24 V b) the instantaneous power supplied to the inductor at t = 3.6 ms. 1.437 W
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- The current in a 62 mH inductor changes with time as I = bt- at. With a = 6 A/s and b = the magnitude of the induced emf, E, at 6 A/s, find t = 0.7 s. Answer in units of V. At what time is the emf zero?A 15.0-mH inductor carries a current i = Imax sin ?t, with Imax = 5.40 A and f = ?/2? = 60.0 Hz. What is the self-induced emf as a function of time? (Express your answer in terms of t where is in volts and t is in seconds. Do not include units in your expression.)The current in a 40.0-mH inductor changes with time as i = 3.00t2 − 5.00t, 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? s
- The current in a 70.0-mH inductor changes with time as I = 3.00t2 − 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? sAfter being closed for a long time, the switch S in the circuit shown in the figure below is thrown open at t = 0. In the circuit, E = 24.0 V, R = 4.50 kO, Rg = 6.80 k2, and L = 570 mH. RA S ③ roo b a ww RB (a) What is the emf across the inductor immediately after the switch is opened? V (b) When does the current in the resistor Rg have a magnitude of 1.00 mA? SA solenoid with 495 turns has a length of 6.50 cm and a cross-sectional area of 3.10 x 10-9 m2. Find the solenoid's inductance and the average emf around the solenoid if the current changes from +4.00 A to -4.00 A in 6.33 x 10-3 s. HINT (a) the solenoid's inductance (in H) H (b) the average emf around the solenoid (in V) v
- Remove the inductor from the circuit in the figure and set R = 216 Q, C = 18.6 µF, fd = 60.0 Hz, and &m = 36.0 V. What are (a) Z, (b) , and (c) I? 90 R L 000 (a) Number Units (b) Number Units (c) Number UnitsA 10.0-mH inductor carries a current /=/max sin wt, with Imax = 5.00 A and f = w/2π = 60.0 Hz. What is the self-induced emf as a function of time?