Magnetism and Electromagnetism Question & AnswersSeptember 13, 2021 By Wat Electrical Leave a Comment This article lists 100 Magnetism and Electromagnetism MCQs for Engineering Students. All the Magnetism and Electromagnetism Questions & Answers given below includes solution and link wherever possible to the relevant topic.Electromagnetism is the class of physics application, that represents the generation of electromagnetic force. This force is generated by the collision of multiple charged atoms or particles with each other on the application of external force. EM field consists of two fields namely electric and magnetic field.Before electromagnetism came into existence, scientists accepted that both electric and magnetic type fields are two different platforms. But later scientist James Maxwell in 1873 practically proved that the electricity and magnetism concept is a single force responsible for interaction between negative and positive charges. Electromagnetism depends on the principle of “Fleming’s right-hand rule” where the direction of force and magnetic type lines are identified. The main advantage of electromagnetism is magnetic type field can be changed when required. The disadvantage of electromagnetism is, it will turn off when an electric field is absent and requires a continuous power supply. A few of the applications of electromagnetism are solenoids, electric motors, power equipment, etc. 1). Electromagnetism is the study of ______ force.ElectricMagneticElectromagneticAll the aboveHintElectromagnetism is the study of electromagnetic type force. 2). Electromagnetism consists of how many number of fields?2345HintElectromagnetism consists of 2 fields namely electric and magnetic. 3). How many interactions does Electromagnetism have?2345HintAn Electromagnetism has 4 interactions like nature, strong, weak, and gravitation type interaction. 4). Which of the following are electroweak type force?Weak forceElectromagnetic type forceHigh type energyAll the aboveHintElectroweak type force includes weak force, electromagnetic type force, and high type energy. 5). Which of the following law defines electromagnetic based phenomena?Lorentz forceNewton’s lawOhms lawAll the aboveHintLorentz force defines electromagnetic-based phenomena in terms of force between electric and magnetic force. 6). Which of the following are involved in Electromagnetism?Electrically charge particlesUncharged magnetic forceAtomsAll the aboveHintThe electromagnetic attraction in Electromagnetism is involved between electrically charged type particles know as atoms and uncharged type magnetic force. 7). _______ type of devices produces electromagnetic field.ElectromagnetsElectrodesMagnetsAll the aboveHintElectromagnets are devices that produce electromagnetic fields. 8). Which of the following components are used for creating magnetic fields?Copper wireIron corePlatinum wireBoth a and bHintIron core and copper wire are used during the creation of magnetic fields. 9). What happens to strength of magnetic field when current is controlled?IncreasesDecreasesControlledZeroHintThe strength of the magnetic field automatically gets in controlled when the current is controlled. 10). Which of the following is an additional phenomena of electromagnetism?Electromagnetic inductionOhms lawFaradays lawCoulomb's lawHintThe additional phenomenon of electromagnetism is electromagnetic induction. Which defines the generation of electric current on the movement of conducting wire through magnetic fields. 11). What happen to currents magnitude when magnetic fields strength changes?SameZeroInfinityChangesHintWhen magnetic fields strength changes, the current also changes. 12). Who has realized electromagnetism?Hans Christian OerstedJamesHenryDennis RichardHintHans Christian Oersted has realized electromagnetism in the year 1820. 13). Which of the following power source Hans Christian Oersted used during realization of electromagnetism?BatteryAmmeterVoltmeterRheostatHintHans Christian Oersted used a battery as a power source during the realization of electromagnetism for supplying current. Read more about Battery 14). Which of the following scientist discovered electrolysis and electromagnetic induction?Michael FaradayHans Christian OerstedJamesHenryHintMichael Faraday is the scientist who discovered electrolysis and electromagnetic induction. 15). Which of the following device allowed Michael Faraday to discover with the guidance of electromagnetic rotary type device?Electric motorElectric instrumentPower recorderOhm meterHintMichael Faraday with the guidance of electromagnetic rotary type device has lead to the discovery of electric motor. Read more about Electric Motor 16). The scientist Faraday has shown the relationship between _______.Magnetism and light raysMagnetism and electronsElectrons and protonsProtons and neutronsHintScientist Faraday has shown the relationship between magnetism and light rays. 17). Which of the following scientist provided an extension to Faradays relationship between magnetism and light rays?James MaxwellMichael FaradayHans Christian OerstedNone of the aboveHintJames Maxwell scientist provided an extension to Faraday's relationship between magnetism and light rays by determining the presence of magnetic poles when there was an interaction between two charged particles. 18). Which of the following is a predominant application of electromagnetism?Electric motorElectric measuring devicesTachometerSpeedometerHintAn electric motor is a predominant application of electromagnetism. Read more about Magnets 19). Which of the following component of electric motor is responsible for rotational moment?MagnetsShaftsRotorAll the aboveHintMagnets of an electric motor are responsible for rotational moment on applying electricity. 20). Which of the following are the other examples that rely on electromagnets?Hard disk drivesVideo cassette recordersDVD’sAll the aboveHintHard disk drives, video cassette recorders, and DVDs are the other examples that rely on electromagnets.Magnetism and Electromagnetism Important MCQ's with Hints 21). Which of the following are the applications of EM waves?RadioTvMobile communicationAll the aboveHintRadio, TV, and mobile communications are the application of EM waves. 22). What is the speed of EM waves?186000 miles/sec200000 miles per second250000 miles per second205000 miles per secondHintThe speed of EM waves is 186000 per second. 23). Which of the following information does not define Maxwell's equation?Subatomic scaleElectron informationCollision informationAll the aboveHintMaxwell's equation does not define the subatomic scale. 24). An electromagnetic field is represented in ______ number of dimensions.2341HintAn electromagnetic field is represented in 3 dimensions, electric, magnetic, and em field. 25). Which of the following is the representation of electric field in vector field type approach?E(x,y,z,t)Q(x,y,z,t)C(x,y,z,t)H(x,y,z,t)HintThe representation of the electric field in the vector field type approach is E (x,y,z,t). Read more about Electric Field 26). Which of the following is the representation of magnetic field in vector field type approach?E(x,y,z,t)Q(x,y,z,t)B(x,y,z,t)H(x,y,z,t)HintThe representation of the magnetic field in vector field type approach is B(x,y,z,t). 27). When only the electric field in a circuit is non zero and is constant with respect to time, then the field is represented as _______.Electro static fieldMagneto static fieldElectric conductivityBoth a and cHintWhen only the electric field in a circuit is non-zero and is constant with respect to time, then the field is represented as electro static field. 28). When only the magnetic field in a circuit is non zero and is constant with respect to time, then the field is represented as _______.Electro static fieldMagneto static fieldElectric conductivityBoth a and cHintWhen only the magnetic field in a circuit is non-zero and is constant with respect to time, then the field is represented as magnetostatic field. 29). According to Maxwell's equations which of the following have time dependencies?ElectricMagneticElectromagneticBoth a and bHintBoth electric and magnetic fields of Maxwell's equations which of the following have time dependencies. 30). Maxwell's equations are represented as _______.ElectrostaticsMagneto staticsElectro dynamicsAll the aboveHintMaxwell's equations are represented as electrostatics, magnetostatics, and electro dynamics. 31). Which of the following equation defines Gauss’s law?ⴟ.E=p/€0ⴟ.B=0ⴟ* E = -[dB/dt]ⴟ* E = -[dB/dt]Hintⴟ.E=p/€0 is the equation that defines Gauss’s law. Where E is the electric field, e=p is charge density, and €0 is the electric constant. 32). Which of the following equation defines Gauss’s law for magnetism?ⴟ.E=p/€0ⴟ.B=0ⴟ* E = -[dB/dt]ⴟ*B=ⴏ0 [J] + ⴏ0 €0 [dE/dt]Hintⴟ.B=0 is the equation that defines Gauss’s law for magnetism. Where B is the magnetic field. 33). Which of the following equation defines Faraday's law?ⴟ.E=p/€0ⴟ.B=0ⴟ* E = -[dB/dt]ⴟ*B=ⴏ0 [J] + ⴏ0 €0 [dE/dt]Hintⴟ* E = -[dB/dt] is the equation that defines Faradays law. 34). Which of the following equation defines Amperes Maxwell’s law?ⴟ.E=p/€0ⴟ.B=0ⴟ* E = -[dB/dt]ⴟ*B=ⴏ0 [J] + ⴏ0 €0 [dE/dt]Hintⴟ*B=ⴏ0 [J] + ⴏ0 €0 [dE/dt] is the equation that defines Amperes Maxwell’s law. 35). Gauss law is related to _______.Electric field distributionElectric charge distributionMagnetic field distributionGeneration of EMHintGauss law is related to electric field distribution. 36). Which of the following scientist formulated Gauss law?JosephFaradaysOhmsBoth b and cHintJoseph Louis scientist formulated Gauss law in the year 1773. 37). Which of the following is an application of Gauss law?Coulombs lawOhms lawFaradays lawAll the aboveHintGauss law is used to derive coulombs law. 38). Gauss law of magnetism is similar to absence of ___ type monopolesElectricMagneticElectromagneticAll the aboveHintGauss's law of magnetism is similar to the absence of magnetic type monopoles. 39). Magnetic field is a ___ type of field?ScalarVectorBoth a and bNone of the aboveHintA magnetic field is a vector type of field having both magnitude and direction. 40). Electric field is a ___ type of field?ScalarVectorBoth a and bNone of the aboveHintAn electric field is a scalar quantity of field having only magnitude. 41). Which of the following are the units of magnetic field?Amperes per meterMetersAmperesAmpere squareHintThe units of a magnetic field is amperes per meter. 42). Which of the following are the units of magnetic flux density?Amperes per meterTeslaMetersAmperesHintThe units of magnetic flux density is amperes per meter. 43). Which of the following are the vector fields of electromagnetics?EHBBoth b and cHintB and H are the vector fields of electromagnetics. 44). Which of the following is the relationship between B,H and ⴏ?ⴏ = BHⴏ = BB=ⴏHBoth a and bHintThe relationship between B, H, and acⴏ is B=ⴏH. 45). Magnetic field vector is also called as______Magnetic flux densityMagnetic inductionMagnetic fieldAll the aboveHintMagnetic field vector is also called magnetic flux density, magnetic induction, and magnetic field. Read more about Magnetic Flux Density 45). Which of the following is the equation of Lorentz force law?F= qE+q(v*B)F= qE-q(v*B)F= qE+q(v)F= qE+q(B)HintThe equation of Lorentz force law is F= qE+q(v*B). where F is force, q- electric charge, v is velocity. 46). Which of the following is used to define direction of force in Lorentz force law?Left hand ruleRight hand ruleConducting ruleBoth a and bHintThe right-hand rule is used to define the direction of a force in Lorentz force law. 47). Which of the following finger in right hand rules points direction of current?ThumbFore figureMiddle figureNone of the aboveHintThe thumb finger in right-hand rule points direction of the current. 48). Which of the following finger in right hand rules points direction of magnet?ThumbFore figureMiddle figureNone of the aboveHintThe forefinger in right-hand rules points the direction of the magnet. 49). Which of the following is the representation of Lorentz equation given with “E,q,F”.F=qEF=qF=EE=qFHintThe representation of Lorentz equation given with “E,q,F” is F=qE. 50). Which of the following is the representation of Lorentz equation given with “v,q,B,F”.F=q(v*B)F=qF=q(v)F=q/(v*B)Hintthe representation of Lorentz equation given with“v,q,B,F” is F=q(v*B) 51). Which of the following is a torque equation of magnetic dipole(m)?T= mBT=m/Bt=mBt=0HintThe torque equation of magnetic dipole(m) is t=mB. 52). One tesla is equal to ____10000 Gauss100Gauss10Gauss1000000GaussHintOne tesla is 10000 Gauss. 53). Which of the following are the names of H fields?Magnetic fieldMagnetizing fieldMagnetic field strengthAll the aboveHintThe names of H fields are Magnetic field, Magnetizing field, Magnetic field strength. 54). Which of the following is the formula of H field?H=[1/ⴏ0] (B-M)H=[1/ⴏ0] (BM)H=[1/ⴏ0] (B+M)H=[1/ⴏ0] (M)HintThe formula of H field H=[1/ⴏ0] (B-M) where M- magnetization vector, ⴏ0- vacuum permeability. 55). Which is the CGS units of H field?OerstedsGaussAmperesAll the aboveHintOersteds is the CGS unit of H field. 56). Which of the following is the device used for measuring magnetic field?MagnetometerAmmeterWattmeterAll the aboveHintA magnetometer is a device used for measuring a magnetic field. 57). Divergence theorem is also known as______Gauss theoremOstrogradskys theoremFaradysBoth a and bHintThe divergence theorem is also known as Gauss theorem and Ostrohradskys theorem which shows the relationship between closed field vectors flux. 58). On which of the following factors do magnetic state depends on?PressureMagnetic fieldTemperatureAll the aboveHintOn the temperature, magnetic field, and pressure factors the state of magnetic depends on. 59). Which of the following are the examples of paramagnetic substance?OxygenAluminumCopperBoth a and bHintExamples of paramagnetic substances include oxygen and aluminum. 60). Which of the following are the examples of diamagnetic substance?OxygenCarbonCopperBoth b and cHintExamples of diamagnetic substances include copper and carbon. 61). Which of the following are anti-ferromagnetic materials?ChromiumSpin glassCopperBoth a and bHintAnti-ferromagnetic materials includes chromium and spin glass. 62). What happens to magnetic field with increase in distance?IncreasesDecreasesZeroConstantHintMagnetic field decreases with an increase in distance. 63). Which of the following is the root cause of magnetism?Electric currentSpin magnetic momentsElectric dipolesBoth a and bHintBoth spin magnetic moments and electric current are the root cause of magnetism. 64). Magnetic properties arise due to moment of ___ElectronsNeutronsProtonsAll the aboveHintMagnetic properties arise due to the moment of electrons. 65). Which of the following type of magnet property oppose applied magnetic based field?DiamagnetismFerromagnetismPara magnetismAll the aboveHintDiamagnetism type of magnet property opposes applied magnetic-based field.Magnetism and Electromagnetism Questions and Answers 66). Which of the following type of magnet property enhances applied external magnetic based field?DiamagnetismFerromagnetismPara magnetismAll the aboveHintParamagnetism magnet property enhances applied external magnetic-based field. 67). A diamagnetic material has ___ unpaired electrons?1230HintA diamagnetic material has ‘0’ unpaired electrons. 68). Which of the following theorem defines impossibility of diamagnetism?Bohr-VanLenseQuantamFaradaysHintBohr-Van theorem defines the impossibility of diamagnetism. 69). _____ type of magnetic material are unpaired electrons?DiamagnetismFerromagnetismPara magnetismAll the aboveHintA paramagnetic type of magnetic material are unpaired electrons. 70). Which of the following principle is required for paramagnetic material for paired electrons?Pauli exclusionInductiveAmperesAll the aboveHintPauli exclusion principle is required for paramagnetic material for paired electrons. 71). In which of the following magnetic type magnetic moments align in direction of applied external magnetic field?DiamagnetismFerromagnetismPara magnetismAll the aboveHintIn paramagnetism, magnetic moments align in direction of the applied external magnetic field. 72). In which of the following magnetic type magnetic moments align in parallel direction with one other?DiamagnetismFerromagnetismPara magnetismAll the aboveHintIn ferromagnetism, magnetic moments align in parallel direction with one other. 73). In which of the following magnetic type Curie temperature is observed?DiamagnetismFerromagnetismPara magnetismAll the aboveHintIn Ferromagnetism Curie temperature is observed. 74). When a ferro magnetic substance loses its ferro magnetic property above a specific point then the point is called_______Curie temperatureBreakdown temperatureThermal expansionAll the aboveHintWhen a ferromagnetic substance loses its ferromagnetic property above a specific point then the point is called curie temperature. 75). Which of the following are the examples of ferromagnetic substance?IronNickleCobaltAll the aboveHintIron, Nickle, and Cobalt are examples of ferromagnetic substances. 76). A magnetic field generated on electric supply is called ____ElectromagnetElectic substanceMagneto substanceAll the aboveHintA magnetic field generated on an electric supply is called an electromagnet. 77). What happens to magnetic field in electromagnetism when electric supply is turned off?GeneratesDoes not generatesBreaks the magnetNone of the aboveHintThe magnetic field in electromagnetism is not generated when the electric supply is turned off 78). Which of the following is the advantage of electromagnetism?Magnetic type field can be changed when requiredTurns off when electric field is not sentRequires continuous power supplyAll the aboveHintThe advantage of electromagnetism is magnetic type field can be changed when required. 79). Which of the following is the disadvantage of electromagnetism?Magnetic type field can be changed when requiredTurns off when electric field is not sentRequires continuous power supplyBoth b and cHintThe disadvantage of electromagnetism is the magnetic field is turned off when an electric field is not set and it requires a continuous power supply. 80). Which of the following is the formula for magnetic fields in vacuum?B= ⴏHB=ⴏ0 (H+M)B=HB=H+MHintThe formula for magnetic fields in a vacuum is B= ⴏH. 81). Which of the following is the formula for magnetic fields in material?B= ⴏHB=ⴏ0 (H+M)B=HB=H+MHintThe formula for magnetic fields in the material is B=ⴏ0 (H+M). 82). Which of the following component in “B=ⴏ0 (H+M)” is called magnetic polarization?ⴏ0ⴏ0Hⴏ0MH+MHintⴏ0M in “B=ⴏ0 (H+M)” is called magnetic polarization. 83). Which of the following law does a Maxwells equations represents?Biot-Savart lawOhms lawFaradays lawFlemings ruleHintMaxwell's equations are represented on the solvation of Biot-Savart law. Read More about Biot-Savart Law 84). What is the SI unit of energy?JouleCoulombAmperesVoltsHintThe SI unit of energy is Joule(J). 85). What is the SI unit of electric charge?JouleCoulombAmperesVoltsHintThe SI unit of electric charge is Coulomb. 86). What is the SI unit of electric current?JouleCoulombAmperesVoltsHintThe SI unit of electric current is Amperes. 87). What is the SI unit of electric current density?JouleAmpere/meter squareAmperesVoltsHintThe SI unit of electric current density is Amperes/meter square. 88). What is the SI unit of potential difference?JouleAmpere/meter squareAmperesVoltsHintThe SI unit of potential difference is volts. 89). What is the SI unit of electric resistance?Ohms meterAmpere/meter squareAmperesOhmsHintThe SI unit of resistance is ohms. 90). What is the SI unit of electric impedance?Ohms meterAmpere/meter squareAmperesOhmsHintThe SI unit of electric impedance is ohms. 91). What is the SI unit of electric reactance?Ohms meterAmpere/meter squareAmperesOhmsHintThe SI unit of electric reactance is ohms. 92). What is the SI unit of resistivity?Ohms meterAmpere/meter squareAmperesOhmsHintThe SI unit of resistivity is ohm meter. 93). What is the SI unit of power?Ohms meterWattsFaradsOhmsHintThe SI unit of power is Watts. 94). What is the SI unit of permittivity?Farad per meterFaradsTeslaSiemensHintThe SI unit of permittivity is Farads per meter. 95). What is the SI unit of magnetic flux.WeberFaradsTeslaSiemensHintWeber is the SI unit of magnetic flux.Magnetism and Electromagnetism MCQ's for Interviews 96). Which of the following are the properties of electromagnetic waves?Perpendicular to each otherTravels in speed of lightExhibits interference propertyAll the aboveHintThe properties of electromagnetic waves are they are perpendicular to each other, travels at the speed of light, and exhibits interference properties. 97). Which of the following is the range of speed of light?3*10 power 83*10 power 63*10 power 73*10 power 9HintThe range of speed of light 3*10 power 8. 98). Which of the following is the equation of light?C= velocity * wavelengthC = velocity *timeC = velocity / timeC= velocity / wavelengthHintThe equation of light is C= velocity * wavelength. 99). Which of the following is the SI unit of permeability?Henry/meterHenryWeberTeslaHintThe SI unit of permeability is Henry/meter. 100). Which of the following is the SI unit of magnetic susceptibility?Henry/meterNo unitsWeberTeslaHintThe SI unit of magnetic susceptibility is no units. Time is Up! Time's up
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