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  • Question

  • The polarity of induced voltage while a field is collapsing is


  • Options
  • A. independent of the force creating the field
  • B. opposite to the force creating the field
  • C. identical to the force creating the field
  • D. present only if the force is stationary

  • Correct Answer
  • opposite to the force creating the field 

    • Magnetism and Electromagnetism problems

    Search Results

    • 1. How much flux is there in a magnetic field when its flux density is 5000 µT and its cross-sectional area is 300 mm2?

    • Options
    • A. 16.67 mWb
    • B. 5.0 µWb
    • C. 3.0 mWb
    • D. 1.5 µWb
      • Discuss
    • 2. Which electromagnetic device contains an armature?

    • Options
    • A. A speaker
    • B. A dc generator
    • C. A relay
    • D. A solenoid
      • Discuss
    • 3. "Series" and "parallel" as applied to dc motors refer to

    • Options
    • A. the connection of the motor and controller
    • B. the connection of the field coil and armature windings
    • C. the connection of the brush and commutator
    • D. the connection of the motor batteries
      • Discuss
    • 4. Which two values are plotted on a B-H curve graph?

    • Options
    • A. Reluctance and flux density
    • B. Permeability and reluctance
    • C. Magnetizing force and permeability
    • D. Flux density and magnetizing force
      • Discuss
    • 5. The unit of flux density is known as

    • Options
    • A. magnetomotive force
    • B. a weber
    • C. a maxwell
    • D. a tesla
      • Discuss
    • 6. Permeability is the inverse equivalent of which electrical term?

    • Options
    • A. Voltage
    • B. Current
    • C. Resistance
    • D. Conductance
      • Discuss
    • 7. 

      Calculate the phase angle in the given circuit.


    • Options
    • A. 0°
    • B. 90°
    • C. 22.52°
    • D. 67.48°
      • Discuss
    • 8. What is the phase angle for a parallel circuit consisting of a 500 kHz, 5 Vac source with a 47 pF capacitor, and a 4.7 kΩ resistor in parallel?

    • Options
    • A. 55.3°
    • B. ?55.3°
    • C. 34.8°
    • D. ?34.8°
      • Discuss
    • 9. Which of the following is the reference vector for parallel RC circuits?

    • Options
    • A. R
    • B. V
    • C. I
    • D. XC
      • Discuss
    • 10. 

      What is the total current in the given circuit?


    • Options
    • A. 0.28 A
    • B. 0.399 A
    • C. 909 A
    • D. 0.2 A
      • Discuss

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