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Electromagnetic Theory and Fields MCQs 2026

46 questions with detailed answers · 16 from past papers · 5 quiz batches available

📚 Electrical Engineering📄 16 Past-Paper Qs✓ Free · No Login Needed
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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 1Questions 1–10 of 46
  1. Q1medium

    Magnetic circuit Ohm law analog: flux equals

    1. AMMF times reluctance
    2. BNI squared
    3. CMMF divided by reluctance
    4. DB only without area
    💡 Explanation:

    phi = F/Rm.

  2. Q2medium

    Displacement current exists in

    1. Apure resistor only
    2. Bcapacitor dielectric between plates during charging
    3. Cshort circuit wire only
    4. Dpermanent magnet only
    💡 Explanation:

    Changing D in gap carries displacement current.

  3. Q3medium

    Electric scalar potential V relates to E as

    1. AE equals V times I
    2. BV equals B A
    3. CE = negative gradient of V
    4. DE equals curl V
    💡 Explanation:

    E = -grad V for static.

  4. Q4hard

    Magnetic vector potential A relates to B as

    1. AB = div A
    2. BA = curl B
    3. CA equals phi
    4. DB = curl A
    💡 Explanation:

    B = curl A gauge choice.

  5. Q5hard

    Boundary condition: normal B is

    1. Aalways zero
    2. Bdiscontinuous always
    3. Ccontinuous (no monopoles)
    4. Dequals H
    💡 Explanation:

    Normal B continuous.

  6. Q6hard

    Boundary condition: tangential E is

    1. Aalways zero
    2. Bdiscontinuous always
    3. Ccontinuous across interface (ideal)
    4. Dequal to B
    💡 Explanation:

    Tangential E continuous.

  7. Q7hard

    Poynting vector represents

    1. Astatic charge only
    2. BDC resistance only
    3. Conly displacement current without E
    4. Ddirection and density of EM power flow
    💡 Explanation:

    S = E x H power per area.

  8. Q8Past Paper · PPSC/FPSC/CSSmedium

    Ampere circuital law for steady conduction is

    1. Aclosed E dl equals dB/dt
    2. Bflux zero always
    3. CD equals rho
    4. Dclosed H dl equals enclosed current
    💡 Explanation:

    Integral H around path = I_enc.

  9. Q9Past Paper · PPSC/FPSC/CSShard

    Biot-Savart law gives B from

    1. Astatic charge only
    2. Bcapacitor voltage only
    3. Ccurrent element geometry
    4. Dresistor color code
    💡 Explanation:

    Differential current creates B.

  10. Q10Past Paper · PPSC/FPSC/CSSmedium

    Electric flux density D equals

    1. Amu H
    2. BB only
    3. CJ always
    4. Depsilon E (in linear isotropic medium)
    💡 Explanation:

    D = epsilon E.

  11. Q11Past Paper · PPSC/FPSC/CSSeasy

    Coulomb law gives electric force

    1. Aproportional to r squared
    2. Bindependent of distance
    3. Cproportional to q1 q2 over r squared
    4. Donly magnetic
    💡 Explanation:

    F = k q1 q2/r².

  12. Q12Past Paper · PPSC/FPSC/CSSeasy

    Faraday law explains operation of

    1. Atransformers and generators
    2. Bpure resistors only
    3. CWheatstone bridge only
    4. DDC resistive dividers only
    💡 Explanation:

    Changing flux induces EMF.

  13. Q13Past Paper · PPSC/FPSC/CSSmedium

    Reluctance Rm in magnetic circuit analog to

    1. Acapacitance
    2. Bresistance in electric circuit
    3. Cinductance only
    4. Dvoltage source
    💡 Explanation:

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

  14. Q14Past Paper · PPSC/FPSC/CSSmedium

    Magnetomotive force (MMF) equals

    1. AB A only
    2. BN I ampere-turns
    3. Cphi/R only
    4. DV/R always
    💡 Explanation:

    MMF = NI.

  15. Q15Past Paper · PPSC/FPSC/CSSeasy

    Magnetic flux density unit is

    1. Atesla (T) or weber per square meter
    2. Bhenry
    3. Cfarad
    4. Dsiemens
    💡 Explanation:

    B in tesla.

  16. Q16hard

    Displacement current density is

    1. Aconduction J only
    2. BB times A
    3. Crate of change of electric flux density (dD/dt)
    4. DH times l
    💡 Explanation:

    Jd = dD/dt.

  17. Q17easy

    Right-hand rule for magnetic field around wire relates

    1. AB parallel to current always
    2. Bthumb current, curled fingers B direction
    3. CE and B same direction
    4. Dflux zero always
    💡 Explanation:

    Standard RH rule for straight conductor.

  18. Q18easy

    Magnetic materials with mu_r much greater than 1 are

    1. Aferromagnetic (e.g. iron)
    2. Bperfect vacuum
    3. Csuperconductors only
    4. Dperfect insulators only
    💡 Explanation:

    High mu_r → ferromagnetic.

  19. Q19hard

    Hysteresis loop area represents

    1. Aenergy loss per cycle in core
    2. Bstored inductance only
    3. Ccapacitance only
    4. Dcharge on plates
    💡 Explanation:

    Loop area = hysteresis loss.

  20. Q20medium

    Eddy currents in core are reduced by

    1. Asolid thick core
    2. Blaminated core sheets
    3. Cincreasing frequency always
    4. Dremoving insulation
    💡 Explanation:

    Laminations increase path resistance.

  21. Q21easy

    Magnetic flux unit is

    1. Atesla only
    2. Bhenry only
    3. Campere only
    4. Dweber (Wb)
    💡 Explanation:

    Phi in webers.

  22. Q22hard

    Permeability of free space mu0 approx

    1. A10^-12 F/m
    2. B377 ohm
    3. C1 H/m
    4. D4 pi times 10^-7 H/m
    💡 Explanation:

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

  23. Q23easy

    Electric field E unit is

    1. Atesla
    2. Bvolts per meter
    3. Cweber
    4. Dhenry
    💡 Explanation:

    E in V/m.

  24. Q24medium

    Maxwell equations unify

    1. Aonly DC resistors
    2. Bonly mechanics
    3. Celectric and magnetic fields with sources and time variation
    4. Donly thermal energy
    💡 Explanation:

    Complete classical EM framework.

  25. Q25medium

    Static charge produces

    1. Acurl E nonzero always
    2. Bdivergence of D equal to rho (Gauss electric)
    3. CB monopoles
    4. Ddisplacement current only
    💡 Explanation:

    Gauss for E in electrostatics.

  26. Q26medium

    Time-varying B produces

    1. Azero E always
    2. Bonly D
    3. Conly H static
    4. Dcurl E (Faraday)
    💡 Explanation:

    Faraday: changing B induces E.

  27. Q27medium

    Magnetic flux linkage lambda equals

    1. Aphi divided by N always
    2. BB only
    3. CN times phi for N turns
    4. DH l only
    💡 Explanation:

    Linkage = N phi.

  28. Q28medium

    Inductance of solenoid increases with

    1. Afewer turns only
    2. Bshorter length with same N always decreases L
    3. Cmore turns and larger cross-section and core permeability
    4. Dair gap removal never matters
    💡 Explanation:

    L proportional to N² mu A/l.

  29. Q29hard

    Energy density in magnetic field is

    1. Aone half B H (or B squared over 2 mu)
    2. BB times A only
    3. CI R only
    4. DQ V only
    💡 Explanation:

    u = 1/2 BH J/m³.

  30. Q30medium

    Magnetic circuit Ohm law analog: flux equals

    1. AMMF times reluctance
    2. BNI squared
    3. CMMF divided by reluctance
    4. DB only without area
    💡 Explanation:

    phi = F/Rm.

  31. Q31hard

    Displacement current density is

    1. Aconduction J only
    2. BB times A
    3. Crate of change of electric flux density (dD/dt)
    4. DH times l
    💡 Explanation:

    Jd = dD/dt.

  32. Q32Past Paper · PPSC/FPSC/CSSeasy

    Magnetic flux density unit is

    1. Atesla (T) or weber per square meter
    2. Bhenry
    3. Cfarad
    4. Dsiemens
    💡 Explanation:

    B in tesla.

  33. Q33Past Paper · PPSC/FPSC/CSSmedium

    Magnetomotive force (MMF) equals

    1. AB A only
    2. BN I ampere-turns
    3. Cphi/R only
    4. DV/R always
    💡 Explanation:

    MMF = NI.

  34. Q34Past Paper · PPSC/FPSC/CSSmedium

    Reluctance Rm in magnetic circuit analog to

    1. Acapacitance
    2. Bresistance in electric circuit
    3. Cinductance only
    4. Dvoltage source
    💡 Explanation:

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

  35. Q35Past Paper · PPSC/FPSC/CSSeasy

    Faraday law explains operation of

    1. Atransformers and generators
    2. Bpure resistors only
    3. CWheatstone bridge only
    4. DDC resistive dividers only
    💡 Explanation:

    Changing flux induces EMF.

  36. Q36Past Paper · PPSC/FPSC/CSSeasy

    Coulomb law gives electric force

    1. Aproportional to r squared
    2. Bindependent of distance
    3. Cproportional to q1 q2 over r squared
    4. Donly magnetic
    💡 Explanation:

    F = k q1 q2/r².

  37. Q37Past Paper · PPSC/FPSC/CSSmedium

    Electric flux density D equals

    1. Amu H
    2. BB only
    3. CJ always
    4. Depsilon E (in linear isotropic medium)
    💡 Explanation:

    D = epsilon E.

  38. Q38Past Paper · PPSC/FPSC/CSShard

    Biot-Savart law gives B from

    1. Astatic charge only
    2. Bcapacitor voltage only
    3. Ccurrent element geometry
    4. Dresistor color code
    💡 Explanation:

    Differential current creates B.

  39. Q39Past Paper · PPSC/FPSC/CSSmedium

    Ampere circuital law for steady conduction is

    1. Aclosed E dl equals dB/dt
    2. Bflux zero always
    3. CD equals rho
    4. Dclosed H dl equals enclosed current
    💡 Explanation:

    Integral H around path = I_enc.

  40. Q40easy

    Right-hand rule for magnetic field around wire relates

    1. AB parallel to current always
    2. Bthumb current, curled fingers B direction
    3. CE and B same direction
    4. Dflux zero always
    💡 Explanation:

    Standard RH rule for straight conductor.

  41. Q41easy

    Magnetic materials with mu_r much greater than 1 are

    1. Aferromagnetic (e.g. iron)
    2. Bperfect vacuum
    3. Csuperconductors only
    4. Dperfect insulators only
    💡 Explanation:

    High mu_r → ferromagnetic.

  42. Q42hard

    Hysteresis loop area represents

    1. Aenergy loss per cycle in core
    2. Bstored inductance only
    3. Ccapacitance only
    4. Dcharge on plates
    💡 Explanation:

    Loop area = hysteresis loss.

  43. Q43medium

    Eddy currents in core are reduced by

    1. Asolid thick core
    2. Blaminated core sheets
    3. Cincreasing frequency always
    4. Dremoving insulation
    💡 Explanation:

    Laminations increase path resistance.

  44. Q44easy

    Magnetic flux unit is

    1. Atesla only
    2. Bhenry only
    3. Campere only
    4. Dweber (Wb)
    💡 Explanation:

    Phi in webers.

  45. Q45hard

    Permeability of free space mu0 approx

    1. A10^-12 F/m
    2. B377 ohm
    3. C1 H/m
    4. D4 pi times 10^-7 H/m
    💡 Explanation:

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

  46. Q46easy

    Electric field E unit is

    1. Atesla
    2. Bvolts per meter
    3. Cweber
    4. Dhenry
    💡 Explanation:

    E in V/m.

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