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. Electric Magnetic Electromagnetic All the above HintElectromagnetism is the study of electromagnetic type force.2). Electromagnetism consists of how many number of fields? 2 3 4 5 HintElectromagnetism consists of 2 fields namely electric and magnetic.3). How many interactions does Electromagnetism have? 2 3 4 5 HintAn Electromagnetism has 4 interactions like nature, strong, weak, and gravitation type interaction.4). Which of the following are electroweak type force? Weak force Electromagnetic type force High type energy All the above HintElectroweak type force includes weak force, electromagnetic type force, and high type energy.5). Which of the following law defines electromagnetic based phenomena? Lorentz force Newton’s law Ohms law All the above HintLorentz 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 particles Uncharged magnetic force Atoms All the above HintThe 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. Electromagnets Electrodes Magnets All the above HintElectromagnets are devices that produce electromagnetic fields.8). Which of the following components are used for creating magnetic fields? Copper wire Iron core Platinum wire Both a and b HintIron core and copper wire are used during the creation of magnetic fields.9). What happens to strength of magnetic field when current is controlled? Increases Decreases Controlled Zero HintThe 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 induction Ohms law Faradays law Coulomb's law HintThe 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? Same Zero Infinity Changes HintWhen magnetic fields strength changes, the current also changes.12). Who has realized electromagnetism? Hans Christian Oersted James Henry Dennis Richard HintHans Christian Oersted has realized electromagnetism in the year 1820.13). Which of the following power source Hans Christian Oersted used during realization of electromagnetism? Battery Ammeter Voltmeter Rheostat HintHans Christian Oersted used a battery as a power source during the realization of electromagnetism for supplying current. Read more about Battery14). Which of the following scientist discovered electrolysis and electromagnetic induction? Michael Faraday Hans Christian Oersted James Henry HintMichael 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 motor Electric instrument Power recorder Ohm meter HintMichael Faraday with the guidance of electromagnetic rotary type device has lead to the discovery of electric motor. Read more about Electric Motor16). The scientist Faraday has shown the relationship between _______. Magnetism and light rays Magnetism and electrons Electrons and protons Protons and neutrons HintScientist 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 Maxwell Michael Faraday Hans Christian Oersted None of the above HintJames 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 motor Electric measuring devices Tachometer Speedometer HintAn electric motor is a predominant application of electromagnetism. Read more about Magnets19). Which of the following component of electric motor is responsible for rotational moment? Magnets Shafts Rotor All the above HintMagnets 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 drives Video cassette recorders DVD’s All the above HintHard disk drives, video cassette recorders, and DVDs are the other examples that rely on electromagnets.Magnetism and Electromagnetism Important MCQ's with Hints21). Which of the following are the applications of EM waves? Radio Tv Mobile communication All the above HintRadio, TV, and mobile communications are the application of EM waves.22). What is the speed of EM waves? 186000 miles/sec 200000 miles per second 250000 miles per second 205000 miles per second HintThe speed of EM waves is 186000 per second.23). Which of the following information does not define Maxwell's equation? Subatomic scale Electron information Collision information All the above HintMaxwell's equation does not define the subatomic scale.24). An electromagnetic field is represented in ______ number of dimensions. 2 3 4 1 HintAn 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 field Magneto static field Electric conductivity Both a and c HintWhen 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 field Magneto static field Electric conductivity Both a and c HintWhen 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? Electric Magnetic Electromagnetic Both a and b HintBoth electric and magnetic fields of Maxwell's equations which of the following have time dependencies.30). Maxwell's equations are represented as _______. Electrostatics Magneto statics Electro dynamics All the above HintMaxwell's equations are represented as electrostatics, magnetostatics, and electro dynamics.31). Which of the following equation defines Gauss’s law? ⴟ.E=p/€0 ⴟ.B=0 ⴟ* 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/€0 ⴟ.B=0 ⴟ* 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/€0 ⴟ.B=0 ⴟ* 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/€0 ⴟ.B=0 ⴟ* 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 distribution Electric charge distribution Magnetic field distribution Generation of EM HintGauss law is related to electric field distribution.36). Which of the following scientist formulated Gauss law? Joseph Faradays Ohms Both b and c HintJoseph Louis scientist formulated Gauss law in the year 1773.37). Which of the following is an application of Gauss law? Coulombs law Ohms law Faradays law All the above HintGauss law is used to derive coulombs law.38). Gauss law of magnetism is similar to absence of ___ type monopoles Electric Magnetic Electromagnetic All the above HintGauss's law of magnetism is similar to the absence of magnetic type monopoles.39). Magnetic field is a ___ type of field? Scalar Vector Both a and b None of the above HintA magnetic field is a vector type of field having both magnitude and direction.40). Electric field is a ___ type of field? Scalar Vector Both a and b None of the above HintAn electric field is a scalar quantity of field having only magnitude.41). Which of the following are the units of magnetic field? Amperes per meter Meters Amperes Ampere square HintThe units of a magnetic field is amperes per meter.42). Which of the following are the units of magnetic flux density? Amperes per meter Tesla Meters Amperes HintThe units of magnetic flux density is amperes per meter.43). Which of the following are the vector fields of electromagnetics? E H B Both b and c HintB and H are the vector fields of electromagnetics.44). Which of the following is the relationship between B,H and ⴏ? ⴏ = BH ⴏ = B B=ⴏH Both a and b HintThe relationship between B, H, and acⴏ is B=ⴏH.45). Magnetic field vector is also called as______ Magnetic flux density Magnetic induction Magnetic field All the above HintMagnetic field vector is also called magnetic flux density, magnetic induction, and magnetic field. Read more about Magnetic Flux Density45). 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 rule Right hand rule Conducting rule Both a and b HintThe 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? Thumb Fore figure Middle figure None of the above HintThe 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? Thumb Fore figure Middle figure None of the above HintThe 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=qE F=q F=E E=qF HintThe 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=q F=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= mB T=m/B t=mB t=0 HintThe torque equation of magnetic dipole(m) is t=mB.52). One tesla is equal to ____ 10000 Gauss 100Gauss 10Gauss 1000000Gauss HintOne tesla is 10000 Gauss.53). Which of the following are the names of H fields? Magnetic field Magnetizing field Magnetic field strength All the above HintThe 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? Oersteds Gauss Amperes All the above HintOersteds is the CGS unit of H field.56). Which of the following is the device used for measuring magnetic field? Magnetometer Ammeter Wattmeter All the above HintA magnetometer is a device used for measuring a magnetic field.57). Divergence theorem is also known as______ Gauss theorem Ostrogradskys theorem Faradys Both a and b HintThe 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? Pressure Magnetic field Temperature All the above HintOn the temperature, magnetic field, and pressure factors the state of magnetic depends on.59). Which of the following are the examples of paramagnetic substance? Oxygen Aluminum Copper Both a and b HintExamples of paramagnetic substances include oxygen and aluminum.60). Which of the following are the examples of diamagnetic substance? Oxygen Carbon Copper Both b and c HintExamples of diamagnetic substances include copper and carbon.61). Which of the following are anti-ferromagnetic materials? Chromium Spin glass Copper Both a and b HintAnti-ferromagnetic materials includes chromium and spin glass.62). What happens to magnetic field with increase in distance? Increases Decreases Zero Constant HintMagnetic field decreases with an increase in distance.63). Which of the following is the root cause of magnetism? Electric current Spin magnetic moments Electric dipoles Both a and b HintBoth spin magnetic moments and electric current are the root cause of magnetism.64). Magnetic properties arise due to moment of ___ Electrons Neutrons Protons All the above HintMagnetic properties arise due to the moment of electrons.65). Which of the following type of magnet property oppose applied magnetic based field? Diamagnetism Ferromagnetism Para magnetism All the above HintDiamagnetism type of magnet property opposes applied magnetic-based field.Magnetism and Electromagnetism Questions and Answers66). Which of the following type of magnet property enhances applied external magnetic based field? Diamagnetism Ferromagnetism Para magnetism All the above HintParamagnetism magnet property enhances applied external magnetic-based field.67). A diamagnetic material has ___ unpaired electrons? 1 2 3 0 HintA diamagnetic material has ‘0’ unpaired electrons.68). Which of the following theorem defines impossibility of diamagnetism? Bohr-Van Lense Quantam Faradays HintBohr-Van theorem defines the impossibility of diamagnetism.69). _____ type of magnetic material are unpaired electrons? Diamagnetism Ferromagnetism Para magnetism All the above HintA paramagnetic type of magnetic material are unpaired electrons.70). Which of the following principle is required for paramagnetic material for paired electrons? Pauli exclusion Inductive Amperes All the above HintPauli 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? Diamagnetism Ferromagnetism Para magnetism All the above HintIn 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? Diamagnetism Ferromagnetism Para magnetism All the above HintIn ferromagnetism, magnetic moments align in parallel direction with one other.73). In which of the following magnetic type Curie temperature is observed? Diamagnetism Ferromagnetism Para magnetism All the above HintIn 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 temperature Breakdown temperature Thermal expansion All the above HintWhen 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? Iron Nickle Cobalt All the above HintIron, Nickle, and Cobalt are examples of ferromagnetic substances.76). A magnetic field generated on electric supply is called ____ Electromagnet Electic substance Magneto substance All the above HintA 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? Generates Does not generates Breaks the magnet None of the above HintThe magnetic field in electromagnetism is not generated when the electric supply is turned off78). Which of the following is the advantage of electromagnetism? Magnetic type field can be changed when required Turns off when electric field is not sent Requires continuous power supply All the above HintThe 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 required Turns off when electric field is not sent Requires continuous power supply Both b and c HintThe 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= ⴏH B=ⴏ0 (H+M) B=H B=H+M HintThe formula for magnetic fields in a vacuum is B= ⴏH.81). Which of the following is the formula for magnetic fields in material? B= ⴏH B=ⴏ0 (H+M) B=H B=H+M HintThe 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? ⴏ0 ⴏ0H ⴏ0M H+M Hintⴏ0M in “B=ⴏ0 (H+M)” is called magnetic polarization.83). Which of the following law does a Maxwells equations represents? Biot-Savart law Ohms law Faradays law Flemings rule HintMaxwell's equations are represented on the solvation of Biot-Savart law. Read More about Biot-Savart Law84). What is the SI unit of energy? Joule Coulomb Amperes Volts HintThe SI unit of energy is Joule(J).85). What is the SI unit of electric charge? Joule Coulomb Amperes Volts HintThe SI unit of electric charge is Coulomb.86). What is the SI unit of electric current? Joule Coulomb Amperes Volts HintThe SI unit of electric current is Amperes.87). What is the SI unit of electric current density? Joule Ampere/meter square Amperes Volts HintThe SI unit of electric current density is Amperes/meter square.88). What is the SI unit of potential difference? Joule Ampere/meter square Amperes Volts HintThe SI unit of potential difference is volts.89). What is the SI unit of electric resistance? Ohms meter Ampere/meter square Amperes Ohms HintThe SI unit of resistance is ohms.90). What is the SI unit of electric impedance? Ohms meter Ampere/meter square Amperes Ohms HintThe SI unit of electric impedance is ohms.91). What is the SI unit of electric reactance? Ohms meter Ampere/meter square Amperes Ohms HintThe SI unit of electric reactance is ohms.92). What is the SI unit of resistivity? Ohms meter Ampere/meter square Amperes Ohms HintThe SI unit of resistivity is ohm meter.93). What is the SI unit of power? Ohms meter Watts Farads Ohms HintThe SI unit of power is Watts.94). What is the SI unit of permittivity? Farad per meter Farads Tesla Siemens HintThe SI unit of permittivity is Farads per meter.95). What is the SI unit of magnetic flux. Weber Farads Tesla Siemens HintWeber is the SI unit of magnetic flux.Magnetism and Electromagnetism MCQ's for Interviews96). Which of the following are the properties of electromagnetic waves? Perpendicular to each other Travels in speed of light Exhibits interference property All the above HintThe 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 8 3*10 power 6 3*10 power 7 3*10 power 9 HintThe range of speed of light 3*10 power 8.98). Which of the following is the equation of light? C= velocity * wavelength C = velocity *time C = velocity / time C= velocity / wavelength HintThe equation of light is C= velocity * wavelength.99). Which of the following is the SI unit of permeability? Henry/meter Henry Weber Tesla HintThe SI unit of permeability is Henry/meter.100). Which of the following is the SI unit of magnetic susceptibility? Henry/meter No units Weber Tesla HintThe SI unit of magnetic susceptibility is no units. Time is Up! Time's up
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