6. An inductor, a 1 kΩ resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is ________.
(a) 0 V
(b) 6 V
(c) 12 V
(d) 4 V
7. An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then ________.
(a) VR ≥ VL
(b) VL < VR
(c) VL = VR
(d) VL > VR
8. A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current ________.
(a) is increased
(b) is decreased
(c) does not change
(d) momentarily goes to zero
9. An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is ________.
(a) good
(b) open
(c) shorted
(d) partly shorted
10. The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is ________.
(a) 1.8 mV
(b) 18 mV
(c) 180 mV
(d) 1.25 mV
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5555555555 20. A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed? (a) 91 mA (b) 78 mA (c) 57 mA (d) 400 mA- 5555555555 2. A 240 μH inductor is equivalent to a ________. (a) 0.240 mH inductor (b) 0.000240 mH inductor (c) 240 mH inductor (d) 240 H inductor
- 5555555555 22. Two inductors, L1 and L2, are in parallel. L1 has a value of 25 μH and L2 a value of 50 μH. The parallel combination is in series with L3, a 20 μH coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is ________. (a) 87 mA (b) 870 mA (c) 87 A (d) 337 mA
- 5555555555 5. An inductance of 0.08 μH is larger than ________. (a) 0.0000008 H (b) 0.000000008 H (c) 0.000008 H (d) 0.00008 mH
- 5555555555 10. The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is ________. (a) 1.8 mV (b) 18 mV (c) 180 mV (d) 1.25 mV