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Home ‣ Electrical Engineering ‣ Magnetism and Electromagnetism Comments
  • Question

  • The direction of a magnetic field within a magnet is


  • Options
  • A. from south to north
  • B. from north to south
  • C. back to front
  • D. front to back

  • Correct Answer
  • from south to north 

    • Magnetism and Electromagnetism problems

    Search Results

    • 1. If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

    • Options
    • A. increases
    • B. decreases
    • C. remains the same
    • D. doubles
      • Discuss
    • 2. For a given wirewound core, an increase in current through the coil

    • Options
    • A. reverses the flux lines
    • B. decreases the flux density
    • C. increases the flux density
    • D. causes no change in flux density
      • Discuss
    • 3. The induced voltage across a stationary conductor in a stationary magnetic field is

    • Options
    • A. zero
    • B. reversed in polarity
    • C. increased
    • D. decreased
      • Discuss
    • 4. The unit for permeability is

    • Options
    • A. Wb/At × m
    • B. At/m
    • C. At/Wb
    • D. Wb
      • Discuss
    • 5. Referring to the given circuit, determine VTH and RTH if a 68 Ω resistor is connected in parallel across R2 and R3.


    • Options
    • A. 3.3 V, 148 Ω
    • B. 330 mV, 148 Ω
    • C. 3.3 V, 68 Ω
    • D. 330 mV, 68 Ω
      • Discuss
    • 6. When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

    • Options
    • A. increases
    • B. decreases
    • C. remains constant
    • D. reaches zero
      • Discuss
    • 7. The ability of a material to remain magnetized after removal of the magnetizing force is known as

    • Options
    • A. permeability
    • B. reluctance
    • C. hysteresis
    • D. retentivity
      • Discuss
    • 8. What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

    • Options
    • A. 18.75 At
    • B. 30 At
    • C. 300 At
    • D. 187 At
      • Discuss
    • 9. When the north poles of two bar magnets are brought close together, there will be

    • Options
    • A. no force
    • B. a downward force
    • C. a force of attraction
    • D. a force of repulsion
      • Discuss
    • 10. What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?

    • Options
    • A. 2,400 At
    • B. 240 At
    • C. 24 At
    • D. 2.4 At
      • Discuss

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