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  • Question
  • The voltage across a coil when di/dt = 20 mA/µs and L = 8 µH is


  • Options
  • A. 16 mV
  • B. 160 mV
  • C. 1.6 mV
  • D. 2.5 mV

  • Correct Answer
  • 160 mV 


  • Inductors problems


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    • 1. A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is

    • Options
    • A. 55 mH
    • B. less than 0.2 mH
    • C. less than 5.5 mH
    • D. 5.5 mH
    • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is

    • Options
    • A. 1.8 mV
    • B. 18 mV
    • C. 180 mV
    • D. 1.25 mV
    • Discuss
    • 7. An inductance of 0.08 µH is larger than

    • Options
    • A. 0.0000008 H
    • B. 0.000000008 H
    • C. 0.000008 H
    • D. 0.00008 mH
    • Discuss
    • 8. An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is

    • Options
    • A. good
    • B. open
    • C. shorted
    • D. partly shorted
    • Discuss
    • 9. A 47 Ω resistor and a capacitor with 150 Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is

    • Options
    • A. Z = 47 Ω + j150 Ω
    • B. Z = 47 Ω ? j150 Ω
    • C. Z = 197 Ω
    • D. Z = 103 Ω
    • Discuss
    • 10. In the complex plane, the number 14 ? j5 is located in the

    • Options
    • A. first quadrant
    • B. second quadrant
    • C. third quadrant
    • D. fourth quadrant
    • Discuss


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