Q1. In an RL series circuit connected to a dc source and a switch, the inductor gets 50% of its maximum current 2.2 s after the switch is closed at time t = 0 s. What is the time constant of this circuit?
Q2. A constant magnetic field of 2.0 T is applied to a rectangular loop of area 4.0x10-2 m2. If the area of this loop changes from its original value to a new value of 2.0x10-2 m2 in 2.0 s, what is the emf induced in the loop?
Q3. A coil with a self-inductance of 4.0 H is connected to a dc source through a switch. As soon as the switch is closed at t = 0 s, the rate of change of current is 2.0 A/s. What is the emf induced in the coil at t = 0 s?
Q4. A series RLC circuit has a 100-O resistor, 6.0-mH inductor, and a 1.0-µF connected to a 120-V rms ac source at f = 60 Hz. What is the power dissipated by the circuit?
Q5. At what frequency f will a 30-mH inductor have an inductive reactance of 1.0 kO?
Q6. A 2.0-kO resistor is connected in series with a 15-mH inductor across an ac source operating at 2.0 KHz. What is the impedance of the RL series combination?
Q7. The capacitive reactance of a 45-µF capacitor in an ac circuit is 9.0 kO. What is the frequency f of the applied signal?
Q8. A 75-W light bulb radiates light uniformly in all directions. What is the average intensity of light from the bulb at a distance of 4.0 m?


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