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  • Question
  • What is the flux density when the flux is 5.5 µWb and the cross-sectional area is 6 × 10?3 m2?


  • Options
  • A. 91.7 µT
  • B. 917 µT
  • C. 91 T
  • D. 9.7 T

  • Correct Answer
  • 917 µT 


  • Magnetism and Electromagnetism problems


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    • 1. A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

    • Options
    • A. 90
    • B. 180
    • C. 270
    • D. 360
    • Discuss
    • 2. A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

    • Options
    • A. increase
    • B. decrease
    • C. remain constant
    • D. be excessive
    • Discuss
    • 3. An electromagnetic field exists only when there is

    • Options
    • A. an increasing current
    • B. decreasing current
    • C. voltage
    • D. current
    • Discuss
    • 4. The voltage induced across a certain coil is 200 mV. A 120 Ω resistor is connected to the coil terminals. The induced current is

    • Options
    • A. 1.7 mA
    • B. 16 mA
    • C. 12 mA
    • D. 120 mA
    • Discuss
    • 5. There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 µWb?

    • Options
    • A. 14,400 At/Wb
    • B. 1,440 At/Wb
    • C. 9,000 At/Wb
    • D. 90,000 At/Wb
    • Discuss
    • 6. If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage

    • Options
    • A. increases
    • B. decreases
    • C. is zero
    • D. will remain constant
    • Discuss
    • 7. A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than

    • Options
    • A. 2 µF
    • B. 4 µF
    • C. 10 µF
    • D. 1.5 µF
    • Discuss
    • 8. When the plate area of a capacitor increases,

    • Options
    • A. the capacitance increases
    • B. the capacitance decreases
    • C. the capacitance is unaffected
    • D. the voltage it can withstand increases.
    • Discuss
    • 9. Two series capacitors (one 2 µF, the other of unknown value) are charged from a 24 V source. The 2 µF capacitor is charged to 16 V and the other to 8 V. The value of the unknown capacitor is

    • Options
    • A. 1 µF
    • B. 2 µF
    • C. 4 µF
    • D. 8 µF
    • Discuss
    • 10. An uncharged capacitor and a 1 kΩ resistor are connected in series with a switch and a 6 V battery. At the instant the switch is closed, the voltage across the capacitor is

    • Options
    • A. 6 V
    • B. 3 V
    • C. 2 V
    • D. 0 V
    • Discuss


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