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Electromagnetic Theory and Fields MCQs 2026

32 questions with detailed answers · 16 from past papers · 4 quiz batches available

📚 Electrical Engineering 📄 16 Past-Paper Qs ✓ Free · No Login Needed
🎯 Mock Test

Read each question, think about the answer, then click Show Answer to reveal the correct option and explanation. Load 10 at a time so it stays manageable — perfect for one-topic study sessions on the bus or during a break.

Page 1 of 1 Questions 1–10 of 32
  1. Q1 hard

    Displacement current density is

    1. A conduction J only
    2. B B times A
    3. C rate of change of electric flux density (dD/dt)
    4. D H times l
    💡 Explanation:

    Jd = dD/dt.

  2. Q2 Past Paper · PPSC/FPSC/CSS easy

    Magnetic flux density unit is

    1. A tesla (T) or weber per square meter
    2. B henry
    3. C farad
    4. D siemens
    💡 Explanation:

    B in tesla.

  3. Q3 Past Paper · PPSC/FPSC/CSS medium

    Magnetomotive force (MMF) equals

    1. A B A only
    2. B N I ampere-turns
    3. C phi/R only
    4. D V/R always
    💡 Explanation:

    MMF = NI.

  4. Q4 Past Paper · PPSC/FPSC/CSS medium

    Reluctance Rm in magnetic circuit analog to

    1. A capacitance
    2. B resistance in electric circuit
    3. C inductance only
    4. D voltage source
    💡 Explanation:

    Rm = l/(mu A); phi = MMF/Rm.

  5. Q5 Past Paper · PPSC/FPSC/CSS easy

    Faraday law explains operation of

    1. A transformers and generators
    2. B pure resistors only
    3. C Wheatstone bridge only
    4. D DC resistive dividers only
    💡 Explanation:

    Changing flux induces EMF.

  6. Q6 Past Paper · PPSC/FPSC/CSS easy

    Coulomb law gives electric force

    1. A proportional to r squared
    2. B independent of distance
    3. C proportional to q1 q2 over r squared
    4. D only magnetic
    💡 Explanation:

    F = k q1 q2/r².

  7. Q7 Past Paper · PPSC/FPSC/CSS hard

    Biot-Savart law gives B from

    1. A static charge only
    2. B capacitor voltage only
    3. C current element geometry
    4. D resistor color code
    💡 Explanation:

    Differential current creates B.

  8. Q8 Past Paper · PPSC/FPSC/CSS medium

    Ampere circuital law for steady conduction is

    1. A closed E dl equals dB/dt
    2. B flux zero always
    3. C D equals rho
    4. D closed H dl equals enclosed current
    💡 Explanation:

    Integral H around path = I_enc.

  9. Q9 Past Paper · PPSC/FPSC/CSS medium

    Electric flux density D equals

    1. A mu H
    2. B B only
    3. C J always
    4. D epsilon E (in linear isotropic medium)
    💡 Explanation:

    D = epsilon E.

  10. Q10 easy

    Right-hand rule for magnetic field around wire relates

    1. A B parallel to current always
    2. B thumb current, curled fingers B direction
    3. C E and B same direction
    4. D flux zero always
    💡 Explanation:

    Standard RH rule for straight conductor.

  11. Q11 easy

    Magnetic materials with mu_r much greater than 1 are

    1. A ferromagnetic (e.g. iron)
    2. B perfect vacuum
    3. C superconductors only
    4. D perfect insulators only
    💡 Explanation:

    High mu_r → ferromagnetic.

  12. Q12 hard

    Hysteresis loop area represents

    1. A energy loss per cycle in core
    2. B stored inductance only
    3. C capacitance only
    4. D charge on plates
    💡 Explanation:

    Loop area = hysteresis loss.

  13. Q13 medium

    Eddy currents in core are reduced by

    1. A solid thick core
    2. B laminated core sheets
    3. C increasing frequency always
    4. D removing insulation
    💡 Explanation:

    Laminations increase path resistance.

  14. Q14 easy

    Magnetic flux unit is

    1. A tesla only
    2. B henry only
    3. C ampere only
    4. D weber (Wb)
    💡 Explanation:

    Phi in webers.

  15. Q15 hard

    Permeability of free space mu0 approx

    1. A 10^-12 F/m
    2. B 377 ohm
    3. C 1 H/m
    4. D 4 pi times 10^-7 H/m
    💡 Explanation:

    mu0 = 4pi x 10^-7 H/m.

  16. Q16 easy

    Electric field E unit is

    1. A tesla
    2. B volts per meter
    3. C weber
    4. D henry
    💡 Explanation:

    E in V/m.

  17. Q17 Past Paper · PPSC/FPSC/CSS easy

    Magnetic flux density unit is

    1. A tesla (T) or weber per square meter
    2. B henry
    3. C farad
    4. D siemens
    💡 Explanation:

    B in tesla.

  18. Q18 easy

    Electric field E unit is

    1. A tesla
    2. B volts per meter
    3. C weber
    4. D henry
    💡 Explanation:

    E in V/m.

  19. Q19 hard

    Permeability of free space mu0 approx

    1. A 10^-12 F/m
    2. B 377 ohm
    3. C 1 H/m
    4. D 4 pi times 10^-7 H/m
    💡 Explanation:

    mu0 = 4pi x 10^-7 H/m.

  20. Q20 easy

    Magnetic flux unit is

    1. A tesla only
    2. B henry only
    3. C ampere only
    4. D weber (Wb)
    💡 Explanation:

    Phi in webers.

  21. Q21 medium

    Eddy currents in core are reduced by

    1. A solid thick core
    2. B laminated core sheets
    3. C increasing frequency always
    4. D removing insulation
    💡 Explanation:

    Laminations increase path resistance.

  22. Q22 hard

    Hysteresis loop area represents

    1. A energy loss per cycle in core
    2. B stored inductance only
    3. C capacitance only
    4. D charge on plates
    💡 Explanation:

    Loop area = hysteresis loss.

  23. Q23 easy

    Magnetic materials with mu_r much greater than 1 are

    1. A ferromagnetic (e.g. iron)
    2. B perfect vacuum
    3. C superconductors only
    4. D perfect insulators only
    💡 Explanation:

    High mu_r → ferromagnetic.

  24. Q24 easy

    Right-hand rule for magnetic field around wire relates

    1. A B parallel to current always
    2. B thumb current, curled fingers B direction
    3. C E and B same direction
    4. D flux zero always
    💡 Explanation:

    Standard RH rule for straight conductor.

  25. Q25 Past Paper · PPSC/FPSC/CSS medium

    Ampere circuital law for steady conduction is

    1. A closed E dl equals dB/dt
    2. B flux zero always
    3. C D equals rho
    4. D closed H dl equals enclosed current
    💡 Explanation:

    Integral H around path = I_enc.

  26. Q26 Past Paper · PPSC/FPSC/CSS hard

    Biot-Savart law gives B from

    1. A static charge only
    2. B capacitor voltage only
    3. C current element geometry
    4. D resistor color code
    💡 Explanation:

    Differential current creates B.

  27. Q27 Past Paper · PPSC/FPSC/CSS medium

    Electric flux density D equals

    1. A mu H
    2. B B only
    3. C J always
    4. D epsilon E (in linear isotropic medium)
    💡 Explanation:

    D = epsilon E.

  28. Q28 Past Paper · PPSC/FPSC/CSS easy

    Coulomb law gives electric force

    1. A proportional to r squared
    2. B independent of distance
    3. C proportional to q1 q2 over r squared
    4. D only magnetic
    💡 Explanation:

    F = k q1 q2/r².

  29. Q29 Past Paper · PPSC/FPSC/CSS easy

    Faraday law explains operation of

    1. A transformers and generators
    2. B pure resistors only
    3. C Wheatstone bridge only
    4. D DC resistive dividers only
    💡 Explanation:

    Changing flux induces EMF.

  30. Q30 Past Paper · PPSC/FPSC/CSS medium

    Reluctance Rm in magnetic circuit analog to

    1. A capacitance
    2. B resistance in electric circuit
    3. C inductance only
    4. D voltage source
    💡 Explanation:

    Rm = l/(mu A); phi = MMF/Rm.

  31. Q31 hard

    Displacement current density is

    1. A conduction J only
    2. B B times A
    3. C rate of change of electric flux density (dD/dt)
    4. D H times l
    💡 Explanation:

    Jd = dD/dt.

  32. Q32 Past Paper · PPSC/FPSC/CSS medium

    Magnetomotive force (MMF) equals

    1. A B A only
    2. B N I ampere-turns
    3. C phi/R only
    4. D V/R always
    💡 Explanation:

    MMF = NI.

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