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  • Question

  • 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

  • Correct Answer
  • decreases 

    • Magnetism and Electromagnetism problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. The unit for permeability is

    • Options
    • A. Wb/At × m
    • B. At/m
    • C. At/Wb
    • D. Wb
      • Discuss
    • 4. 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
    • 5. In a two-source circuit, one source acting alone produces 12 mA through a given branch. The other source acting alone produces 10 mA in the opposite direction through the same branch. The actual current through the branch is

    • Options
    • A. 22 mA
    • B. 12 mA
    • C. 10 mA
    • D. 2 mA
      • Discuss
    • 6. 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
      • Discuss
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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

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