Question

12. An emf of 96.0 mV is induced in the windings of a coil when the current in a nearby coil is increasing at the rate of 1.20 A/s. What is the mutual inductance of the two coils? A. 12mH B. 20 mH C.40 mH D. 80 mH For items 13-15 consider the RL circuit shown at left with the following values ε-12.OV, R ; 6.0 Ω and Le 30.0 mH. Switch s L is set at position a at t Os. 13. What is the time constant of the ciruit? A. 5 ms B, 150 ms C, 0.2 s D. 2.0 s 14. What is the current in the circuit att- 2.0 ms? B. 0.33 C. 0.66A D. 0A 15. What is the voltage across the resistor at t-0s? B. 6.0 VC. 12.0V D. cannot be determined from the give information. 16. An inductor that has an inductance of 15.0 H and a resistance of 30.0 Ω is connected across a 100-V battery. What is the rate of increase of the current at t-1.50 s? A. 0.67A/s B.0.33A/s C. 0.11 A/s D. OA/s 17.Two solenoids A and B, spaced close to each other and sharing the same cylindrical axis, have 400 and 700 turns, respectively. A current of 3.5 A in coil A produces an average flux of 300 uWb through each turn of A and a flux of 90.0 HWb through each turn of B. What is the mutual inductance of the two solenoids. A. 9mH 18. Which of the following is TRUE about a circuit containing a capacitor connected to an AC source? A. The current lags the voltage by 90° B. The voltage leads the current by 90° C. The current sometimes lead the voltage by 90. D. None of the choices is true. B. 18 mH C. 4.5 mH D. none of the choices

Answer 1

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