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  • Question

  • 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

  • Correct Answer
  • VL > VR 

    • Inductors problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. An inductance of 0.43 mH is smaller than

    • Options
    • A. 43 µH
    • B. 430 µH
    • C. 0.05 H
    • D. 0.00043 H
      • Discuss

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