Electromagnetic Field Theory Question & AnswersSeptember 20, 2021 By Wat Electrical Leave a Comment This article lists 100 Electromagnetic Field Theory MCQs for Engineering Students. All the Electromagnetic Field Theory Questions & Answers given below includes solution and link wherever possible to the relevant topic.The electromagnetic field is produced by the interaction of time-varying electric and magnetic fields. The field is a function that specifies a particular quantity everywhere in a region.So, whenever the electromagnetic fields are interacting with each other which is the time-varying that leads to the electromagnetic field. The theory that deals with the interaction of the electric fields and magnetic fields in a particular region are called electromagnetic field theory. 1). The time-varying electric field produces _____________ fieldElectricMagneticElectro-magneticNone of the aboveHintThe time-varying electric field produces a magnetic field 2). When the electric field interacts with the magnetic field that is known as _____________ fieldElectricMagneticElectromagneticNone of the aboveHintWhen the electric field interacts with the magnetic field that is known as the electromagnetic field 3). ____________ is also known as magnetostaticsStatic magnetic fieldStatic electric fieldElectric staticsNone of the aboveHintThe static magnetic field is also known as magnetostatics 4). The circuit theory deals with _______________CurrentVoltageBoth a and bNone of the aboveHintThe circuit theory deals with both current and voltage 5). The field theory deals with _______________ fieldElectric fieldMagnetic fieldBoth a and bNone of the aboveHintThe field theory deals with both electric and magnetic fields 6). The voltage and current in a circuit theory are ______________ScalarVectorVoltage is scalar and current is a vectorVoltage is vector and current is a scalarHintThe voltage and current in a circuit theory are scalars 7). The radiation effects are neglected in ______________ theoryCircuit theoryField theoryBoth a and bNone of the aboveHintThe radiation effects are neglected in circuit theory 8). What is the unit of conductivity?Siemen/meterFaradRadian/secondCoulomb/meter^3HintThe unit of conductivity is siemens/meter 9). Which one of the following is only useful in low frequency?Circuit theoryField theoryBoth a and bNone of the aboveHintThe circuit theory is only useful in low frequency whereas field theory is independent of frequency 10). The cartesian coordinate system is a _____________ systemLeft handRight handBoth a and bNone of the aboveHintThe cartesian coordinate system is a right-hand system 11). In rectangular coordinate system the coordinates are _____________X-axisY-axisZ-axisAll of the aboveHintIn a rectangular coordinate system the coordinates are x-axis, y-axis, and z-axis 12). The vectors are represented by ______________MagnitudeDirectionBoth a and bNone of the aboveHintThe vectors are represented by both magnitude and direction 13). The magnitude of a vector is always _____________PositiveNegativeEither positive or negativeNone of the aboveHintThe magnitude of a vector is always positive 14). ______________ product is also known as a scalar productDotCrossBoth a and bNone of the aboveHintThe dot product is also known as a scalar product 15). The Cartesian coordinate system is also known as ______________ coordinate systemRectangularSquareTriangularNone of the aboveHintThe Cartesian coordinate system is also known as the rectangular coordinate system 16). The strengths of the electric field measured in ______________Ampere/meterVolt/meterHenryNone of the aboveHintThe strengths of the electric field measured in volts per meter 17). The fields are categorized into ____________ typesOneTwoThreeFourHintThe fields are categorized into two types they are scalar and vector 18). The strengths of the magnetic field measured in ______________Ampere/meterVolt/meterHenryNone of the aboveHintThe strengths of the magnetic field measured in ampere per meter 19). Which one of the following is produced by the current?Electric fieldMagnetic fieldBoth a and bNone of the aboveHintThe magnetic field is produced by the current 20). What is the unit of magnetic vector potential?Wb/mA/m^2W/m^2None of the aboveHintThe unit of magnetic vector potential is weber per meter 21). The lens and parabolic antennas are used at ___________ frequencyHighLowBoth a and bMicrowaveHintThe lens and parabolic antennas are used at microwave frequency 22). Which one of the following is measured using a magnetometer?Electric fieldMagnetic fieldBoth a and bNone of the aboveHintThe magnetic field is measured using a magnetometer 23). Which one of the following is proportional to an electric charge?Electric fieldMagnetic fieldBoth a and bNone of the aboveHintThe electric field is proportional to an electric charge 24). The angle dependence is present in _____________ fieldElectric fieldMagnetic fieldElectromagneticNone of the aboveHintThe angle dependence is present in the magnetic field 25). Which one of the following fields obeys the principle of superposition?Electric fieldMagnetic fieldBoth a and bNone of the aboveHintThe electric and magnetic fields both obey the principle of superpositionElectromagnetic Field Theory Important MCQs 26). Which one of the following fields obeys inverse square law?Electric fieldMagnetic fieldBoth a and bNone of the aboveHintThe electric and magnetic fields both obey inverse square law 27). The isolated poles do not exist in __________ fieldElectric fieldMagnetic fieldBoth a and bNone of the aboveHintThe isolated poles do not exist in a magnetic field 28). In the gravitational field, the force is applied to a ____________MassChargeBoth a and bNone of the aboveHintIn the gravitational field, the force is applied to a mass 29). In the gravitational field, the direction of the force is ____________Same as the fieldOpposite to the filedPerpendicular to the fieldNone of the aboveHintIn the gravitational field, the direction of the force is the same as the field 30). The direction of the force in an electric field is _____________Same as the fieldOpposite to the filedPerpendicular to the fieldOpposite or in the same direction of the fieldHintThe direction of the force in an electric field is opposite or in the same direction of the field 31). The ratio of force by unit charge is known as _______________ intensityElectric fieldMagnetic fieldElectrostaticsNone of the aboveHintThe ratio of force by unit charge is known as electric field intensity 32). What is the unit of permittivity?F/MA/MV/MNone of the aboveHintThe unit of permittivity is farad per meter 33). Which one of the following charges is in steady motion?Magnetostatics chargesElectromagnetic chargesBoth a and bNone of the aboveHintThe magneto-statics charges are in steady motion 34). The force in an electric field is proportional to ______________SpeedElectric chargeMagnetic fieldNone of the aboveHintThe force in an electric field is proportional to electric charge 35). Which one of the following is represented by a letter B?Magnetic field intensityMagnetic flux densityElectric field densityNone of the aboveHintThe magnetic flux density is represented by a letter B 36). What is the unit of admittance?SiemenFaradRadian/secondJouleHintThe unit of admittance is Siemen 37). Which one of the following can be analyzed in circuit theory?TransmitterReceiverBoth a and bNone of the aboveHintThe transmitter and receiver both are analyzed in circuit theory 38). Which one of the following is denoted by a symbol ꙍ?ConductivityAdmittanceAngular frequencyConductivityHintThe angular frequency is denoted by a symbol ꙍ 39). Which one of the following is not a vector type?Free chargeElectric flux densityElectric field intensityNone of the aboveHintThe free charge is not a vector type 40). ________________ are the different kinds of coordinate systemsCartesianCylindricalSphericalAll of the aboveHintThe Cartesian, cylindrical, and spherical are the three kinds of coordinate systems 41). What is the unit of the velocity of free charge?m/sA/m^2W/m^2None of the aboveHintThe unit of the velocity of free charge is meters per second 42). What is the unit of the Poynting vector?m/sA/m^2W/m^-2None of the aboveHintThe unit of Poynting vector is watts per square meter 43). Which one of the following is perpendicular to the magnetic field?Electric fieldElectromagnetic fieldBoth a and bNone of the aboveHintThe electric field is perpendicular to the magnetic field 44). Which one of the following is represented by a letter D?Magnetic field intensityMagnetic flux densityElectric field densityElectric flux densityHintThe electric flux density is represented by a letter D 45). What is the unit of angular frequency?SiemenFaradRadian/secondJouleHintThe unit of angular frequency is radian/second 46). Which one of the following is denoted by a symbol Y?ConductivityAdmittanceAngular frequencyConductivityHintThe admittance is denoted by a letter Y 47). What is the unit of electric potential?m/sA/m^2W/m^2VoltsHintThe unit of electric potential is volts 48). __________ is a multi-band high frequency receiving antennaFolded dipoleLog-dipoleBoth a and bNone of the aboveHintThe log-dipole is a multi-band high frequency receiving antenna 49). _________ are the coordinates of the spherical coordinate systemx, y, zr, ф, θr, фNone of the aboveHintThe r, ф, θ are the coordinates of the spherical coordinate system 50). What is the unit of electrical conductivity?Sm^-1Ωm^-1m^-1None of the aboveHintThe unit of electrical conductivity is Sm^-1Electromagnetic Field Theory MCQs for Quiz 51). What is the unit of the velocity of free charge?m/sA/m^2W/m^2None of the aboveHintThe unit of the velocity of free charge is meters per second 52). Which one of the following is a Lorentz force equation?F=qE+qv*BF=qE*BF=qE+qvNone of the aboveHintThe Lorentz force is given by F=qE+qv*B 53). Which one of the following is represented by a letter E?Magnetic field intensityMagnetic flux densityElectric field intensityElectric flux densityHintThe electric field intensity is represented by a letter D 54). What is the unit of angular frequency?SiemenFaradRadian/secondJouleHintThe unit of angular frequency is radian/second 55). Which one of the following is denoted by a symbol ρ?ConductivityAdmittanceAngular frequencyCharge densityHintThe charge density is denoted by a symbol ρ 56). Which one of the following is not a scalar type?Free chargeElectric potentialElectric currentPoynting vectorHintThe pointing vector is not a vector type 57). What is the unit of volume current density?m/sA/m^2W/m^2None of the aboveHintThe unit of volume current density is ampere per meter square 58). What is the unit of Reluctance?SiemenHenry^-1Radian/secondCoulomb/meter^3HintThe unit of Reluctance is henry^-1 59). Which one of the following is denoted by a symbol G?ConductivityAdmittanceAngular frequencyConductivityHintThe conductivity is denoted by a letter G 60). What is the unit of electric field intensity?A/m^2W/m^-2Volt per meterm/sHintThe unit of electric field intensity is volt per meter Read more about Electric Field Intensity 61). In the cylindrical coordinate system the coordinates are represented by __________x, y, zr, θ, zr, ф, zNone of the aboveHintIn the cylindrical coordinate system, the coordinates are represented by r, θ, and z 62). ____________ are the examples of vector quantityForceAccelerationDisplacementAll of the aboveHintThe force, acceleration, and displacement are examples of the vector quantity 63). ____________ are the examples of scalar quantityDensityMassEnergyAll of the aboveHintThe density, mass, and energy are examples of the scalar quantity 64). Which one of the following quantities has no direction?ScalarVectorBoth a and bNone of the aboveHintThe scalar quantity has no direction 65). What is the unit of permittivity?SiemenFarad/meterRadian/secondCoulomb/meter^3HintThe unit of permittivity is farad/meter 66). Which one of the following is denoted by a symbol Z?ImpedanceAdmittanceAngular frequencyConductivityHintThe impedance is denoted by a letter Z 67). The movement in the electric field is perpendicular to the ___________ fieldElectricMagneticElectrostaticsNone of the aboveHintThe movement in the electric field is perpendicular to the magnetic field 68). The distance is ______________ than magnitude of displacementGreater thanLess thanEqual toGreater than or equal toHintThe distance is greater than or equal to the magnitude of the displacement Read more about Displacement 69). The movement in the magnetic field is perpendicular to the ___________ fieldElectricMagneticElectrostaticsNone of the aboveHintThe movement in the magnetic field is perpendicular to the electric field 70). Which one of the following is not easily shielded?Electric fieldMagnetic fieldBoth a and bNone of the aboveHintThe magnetic field is not easily shielded whereas the electric field is easily shielded 71). What is the unit of charge density?SiemenFaradRadian/secondCoulomb/meter^3HintThe unit of charge density is coulomb/meter^3 72). Which one of the following is denoted by a symbol µ?PermeabilityAdmittanceAngular frequencyConductivityHintThe permeability is denoted by a symbol µ 73). The displacement is ______________ than magnitude of distanceGreater thanLess thanEqual toless than or equal toHintThe displacement is less than or equal to the magnitude of the distance 74). Which one of the following is a scalar quantity?DistanceDisplacementBoth a and bNone of the aboveHintThe distance is a scalar quantity whereas displacement is a vector quantity 75). What is the unit of distance and displacement?MeterHenryAmpereNone of the aboveHintThe unit of distance and displacement is meterElectromagnetic Field Theory MCQs for Exams 76). The distance measured is always __________PositiveNegativeBoth a and bNone of the aboveHintThe distance measured is always positive 77). The displacement is __________ depending on the reference pointPositiveNegativePositive or negativeNone of the aboveHintThe displacement can be positive or negative depending on the reference point 78). The scalar quantity is always _____________ dimensionalOneTwoThreeMultiHintThe scalar quantity is always one dimensional 79). The vector quantity is always _____________ dimensionalOneTwoThreeOne, two, or threeHintThe vector quantity can be one dimensional, two dimensional, or three dimensional 80). What is the unit of Planck’s constant?Henry/meterJoule-secAtoms/moleNone of the aboveHintThe unit of Planck’s constant is joule-sec 81). What is the unit of Avogadro’s number?Henry/meterJoule-secAtoms/moleNone of the aboveHintThe unit of Avogadro’s number is atoms per mole 82). What are the applications of electrostatics?Charged coupled device camerasElectro paintingAir cleanersAll of the aboveHintThe charged coupled device cameras, electro painting, air cleaners are few applications of electrostatics 83). ______________ are the applications of magnetismCompassesMagnetic resonance imagingMaglev trainsAll of the aboveHintThe compasses, magnetic resonance imaging, maglev trains are few applications of magnetism 84). Which one of the following antenna is a wideband antenna?HertzFolded dipoleMarconiNone of the aboveHintThe folded dipole antenna is a wideband antenna 85). Which one of the following is denoted by a symbol Ɛ?PermeabilityAdmittanceAngular frequencyPermittivityHintThe permittivity is denoted by a symbol Ɛ 86). What is the unit of magneto-motive force?SiemenFaradRadian/secondAmpere-turnHintThe unit of magneto-motive force is ampere-turn 87). Which one of the following is a vector quantity?DistanceDisplacementBoth a and bNone of the aboveHintThe displacement is a vector quantity whereas distance is a scalar quantity 88). The loop antenna radiation pattern is ____________SquareTriangularLimacon or cardioidNone of the aboveHintThe loop antenna radiation pattern is Limacon or cardioid 89). The satellite communication frequency range is between _______________30-300 MHz300-3000 MHz100-300 MHz3000-30000 MHzHintThe satellite communication frequency range is between 3000-30000 MHz 90). What is the unit of conductance?SiemenFaradRadian/secondCoulomb/meter^3HintThe unit of conductance is Siemen 91). Which one of the following is represented by a letter H?Magnetic field intensityMagnetic flux densityElectric field densityNone of the aboveHintThe magnetic field intensity is represented by a letter H 92). Which one of the following charges is in time-varying motion?Magnetostatics chargesElectromagnetic chargesBoth a and bNone of the aboveHintThe electromagnetic charges are in time-varying motion 93). Which one of the following is measured using an electrometer?Electric fieldMagnetic fieldBoth a and bNone of the aboveHintThe electric field is measured using an electrometer 94). Which one of the following is perpendicular to an electric field?Electric fieldElectromagnetic fieldMagnetic fieldNone of the aboveHintThe magnetic field is perpendicular to an electric field 95). What is the unit of permeability?SiemenHenry/meterRadian/secondAmpere-turnHintThe unit of permeability is henry/meter 96). ______________ product is also known as the vector productDotCrossBoth a and bNone of the aboveHintThe cross product is also known as the vector product 97). Which one of the following is independent of frequency?Circuit theoryField theoryBoth a and bNone of the aboveHintThe field theory is independent of frequency 98). The electric and magnetic fields in a field theory are ______________ScalarVectorElectric is scalar and magnetic is the vectorMagnetic is vector and electric is scalarHintThe electric and magnetic fields in a field theory are vectors 99). ____________ is also known as electric staticsStatic magnetic fieldStatic electric fieldElectric staticsNone of the aboveHintThe static electric field is also known as electric statics 100). The time-varying magnetic field produces _____________ fieldElectricMagneticElectro-magneticNone of the aboveHintThe time-varying magnetic field produces an electric field Time is Up! Time's up
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