Discussion
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- Question
When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
Options- A. increases
- B. decreases
- C. remains the same
- D. doubles
- Correct Answer
- decreases
- 1. A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is
Options- A. 9.9 mH
- B. greater than 5 mH
- C. 9.9 mH or greater than 5 mH
- D. less than 0.6 mH Discuss
- 2. An 18 V power supply is connected across a coil with a winding resistance of 180 Ω. Current flow in the coil is
Options- A. 1 mA
- B. 10 mA
- C. 100 mA
- D. 1 A Discuss
- 3. 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?
Options- A. 91 mA
- B. 78 mA
- C. 57 mA
- D. 400 mA Discuss
- 4. The following coils are in parallel: 75 µH, 40 µH, 25 µH, and 15 µH. The total inductance is approximately
Options- A. 6.9 µH
- B. 14 µH
- C. 2.2 µH
- D. 155 µH Discuss
- 5. Three 15 mH inductors are in series. The total inductance is
Options- A. 15 mH
- B. 30 mH
- C. 45 mH
- D. 5 mH Discuss
- 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
Options- A. 0 V
- B. 6 V
- C. 12 V
- D. 4 V Discuss
- 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
Options- A. VR ? VL
- B. VL < VR
- C. VL = VR
- D. VL > VR Discuss
- 8. A 240 µH inductor is equivalent to a
Options- A. 0.240 mH inductor
- B. 0.000240 mH inductor
- C. 240 mH inductor
- D. 240 H inductor Discuss
- 9. Five inductors are connected in series. The lowest value is 8 ?H. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is
Options- A. 8 H
- B. 32 ?H
- C. 64 ?H
- D. 248 ?H Discuss
- 10. The winding resistance of a coil can be increased by
Options- A. increasing the number of turns
- B. using a thinner wire
- C. changing the core material
- D. increasing the number of turns or using thinner wire Discuss
Inductors problems
Search Results
Correct Answer: less than 0.6 mH
Correct Answer: 100 mA
Correct Answer: 78 mA
Correct Answer: 6.9 µH
Correct Answer: 45 mH
Correct Answer: 6 V
Correct Answer: VL > VR
Correct Answer: 0.240 mH inductor
Correct Answer: 248 ?H
Correct Answer: increasing the number of turns or using thinner wire
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