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  • Question
  • 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

  • Correct Answer
  • 6 V 


  • Inductors problems


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    • 1. 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
    • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field

    • Options
    • A. is quartered
    • B. quadruples
    • C. doubles
    • D. does not change
    • Discuss


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