# Magnetic Circuit MCQs Questions Answers [TOP 50]

Magnetic Circuit MCQs Questions Answers [TOP 50]: A magnetic circuit refers to the path followed by magnetic flux through a material or a series of materials. It is analogous to an electrical circuit, where the flow of current is determined by the electrical resistance and electromotive force. In a magnetic circuit, the flow of magnetic flux is governed by magnetic reluctance and magnetomotive force.

The key components of a magnetic circuit are:

1.    Magnetic Field Strength: Magnetic field strength (H) represents the intensity of the magnetic field within the magnetic circuit. It is defined as the amount of magnetomotive force (MMF) per unit length of the magnetic path and is measured in Ampere-turns per meter (A-turn/m).

2.    Magnetomotive Force: Magnetomotive force (MMF) is the driving force that establishes the magnetic field within the magnetic circuit. It is analogous to voltage in an electrical circuit and is measured in Ampere-turns (A-turn).

3.    Magnetic Reluctance: Magnetic reluctance is the property of a material that opposes the establishment of magnetic flux. It is analogous to electrical resistance and is measured in Ampere-turns per Weber (A-turn/Wb). It is determined by the dimensions, material properties, and the presence of air gaps or other non-magnetic substances in the magnetic path.

4.    Magnetic Permeability: Magnetic permeability (μ) is a measure of a material’s ability to conduct magnetic flux. It is defined as the ratio of the magnetic flux density (B) to the magnetic field strength (H) and is measured in Henry per meter (H/m). Different materials have different permeabilities, and it affects the overall magnetic behavior of the circuit.

## Magnetic circuits problems and solutions | What is Magnetic Circuit?

1. Which law relates the magnetic field strength (H), magnetic flux density (B), and magnetic permeability (μ) in a magnetic circuit?

a) Ohm’s law

c) Ampere’s law

d) Gauss’s law

2. Magnetic permeability is a measure of:

a) The strength of the magnetic field

b) The ability of a material to conduct magnetic flux

c) The resistance of a material to magnetic flux

d) The voltage induced in a circuit by changing magnetic flux

Answer: b) The ability of a material to conduct magnetic flux

3. The unit of magnetic flux density (B) is:

a) Tesla

b) Ampere

c) Henry

d) Weber

4. The magnetic circuit is analogous to which of the following electrical circuit elements?

a) Resistor

b) Capacitor

c) Inductor

d) Transformer

5. In a magnetic circuit, the magnetic flux is analogous to which quantity in an electrical circuit?

a) Current

b) Voltage

c) Resistance

d) Power

6. In a magnetic circuit, the magnetomotive force (MMF) is analogous to which quantity in an electrical circuit?

a) Current

b) Voltage

c) Resistance

d) Power

7. The reluctance of a magnetic circuit is analogous to which quantity in an electrical circuit?

a) Conductance

b) Resistance

c) Capacitance

d) Inductance

8. The magnetic field strength (H) is defined as:

a) The force experienced by a unit magnetic pole

b) The number of magnetic field lines passing through a unit area

c) The product of magnetic flux density and magnetic permeability

d) The magnetomotive force per unit length of the magnetic path

Answer: d) The magnetomotive force per unit length of the magnetic path

9. Which material has the highest magnetic permeability?

a) Air

b) Copper

c) Iron

d) Aluminum

10. The reluctance of a magnetic circuit is inversely proportional to:

a) Magnetic flux

b) Magnetic field strength

c) Magnetic permeability

d) Magnetomotive force

11. The magnetic flux in a magnetic circuit is directly proportional to:

a) Magnetic field strength

b) Magnetic permeability

c) Reluctance

d) Magnetomotive force

12. In a closed magnetic circuit, the total magnetic flux is:

a) Zero

b) Constant

c) Changing

d) Depends on the material

13. The total magnetomotive force in a series magnetic circuit is equal to:

a) The sum of the individual magnetomotive forces

b) The average of the individual magnetomotive forces

c) The product of the individual magnetomotive forces

d) None of the above

Answer: a) The sum of the individual magnetomotive forces

14. In a parallel magnetic circuit, the total reluctance is equal to:

a) The sum of the individual reluctances

b) The average of the individual reluctances

c) The product of the individual reluctances

d) None of the above

Answer: b) The average of the individual reluctances

15. In a magnetic circuit, the magnetic field lines tend to follow the path of:

a) Maximum magnetic permeability

b) Minimum magnetic permeability

c) Maximum magnetic field strength

d) Minimum magnetic field strength

16. The magnetic field strength (H) inside a magnetic material is:

a) Higher than outside the material

b) Lower than outside the material

c) Same as outside the material

d) Depends on the material

Answer: a) Higher than outside the material

17. The magnetic field strength (H) in a magnetic circuit is inversely proportional to:

a) Magnetic flux

b) Magnetic permeability

c) Reluctance

d) Magnetomotive force

18. The concept of magnetic circuit is useful in the design of:

a) Transformers

b) Electric motors

c) Inductors

d) All of the above

Answer: d) All of the above

19. Which of the following is true for a magnetic circuit with a gap?

a) The reluctance is lower compared to a closed magnetic circuit

b) The reluctance is higher compared to a closed magnetic circuit

c) The magnetic flux is higher compared to a closed magnetic circuit

d) The magnetic flux is lower compared to a closed magnetic circuit

Answer: b) The reluctance is higher compared to a closed magnetic circuit

20. The main purpose of a magnetic circuit is to:

a) Store magnetic energy

b) Control the flow of magnetic flux

c) Generate an electromotive force

d) Generate a magnetic field

Answer: b) Control the flow of magnetic flux

## Magnetic circuits problems and solutions pdf | parallel magnetic circuit problems and solutions pdf

21. In a magnetic circuit, the magnetic field intensity (H) is measured in:

a) Ohms

b) Amperes per meter

c) Volts

d) Newtons

22. The magnetic flux is defined as:

a) The force experienced by a magnetic pole

b) The number of magnetic field lines passing through a surface

c) The product of magnetic field strength and magnetic permeability

d) The magnetomotive force per unit area

Answer: b) The number of magnetic field lines passing through a surface

23. The unit of magnetic reluctance is:

a) Tesla

b) Ampere

c) Henry

d) Permeability

24. Which material has the lowest magnetic permeability?

a) Air

b) Copper

c) Iron

d) Aluminum

25. The concept of magnetic reluctance is similar to which concept in electrical circuits?

a) Resistance

b) Conductance

c) Capacitance

d) Inductance

26. In a series magnetic circuit, the total magnetic flux is:

a) The sum of the individual fluxes

b) The average of the individual fluxes

c) The product of the individual fluxes

d) None of the above

Answer: a) The sum of the individual fluxes

27. In a parallel magnetic circuit, the total reluctance is:

a) The sum of the individual reluctances

b) The average of the individual reluctances

c) The product of the individual reluctances

d) None of the above

Answer: a) The sum of the individual reluctances

28. In a magnetic circuit, the ratio of magnetic flux to magnetomotive force is called:

a) Magnetic field strength

b) Magnetic permeability

c) Magnetic reluctance

d) Magnetic inductance

29. The magnetic circuit is open when:

a) There is a gap in the magnetic path

b) The magnetic material is saturated

c) The magnetic field strength is zero

d) The magnetic permeability is infinite

Answer: a) There is a gap in the magnetic path

30. The magnetic flux in a magnetic circuit is proportional to:

a) Magnetic field strength

b) Magnetic permeability

c) Reluctance

d) Magnetomotive force

## Parallel magnetic circuit problems and solutions | Series magnetic circuit problems and solutions NEET

31. The magnetic circuit is analogous to which component in an electrical circuit?

a) Resistor

b) Capacitor

c) Inductor

d) Transformer

32. The property of a material that determines its ability to conduct magnetic flux is called:

a) Magnetic permeability

b) Magnetic inductance

c) Magnetic reluctance

d) Magnetic field strength

33. Which of the following factors affects the magnetic reluctance of a magnetic circuit?

a) Length of the magnetic path

b) Cross-sectional area of the magnetic path

c) Permeability of the material

d) All of the above

Answer: d) All of the above

34. The magnetic field strength inside a magnetic material depends on:

a) The magnetic permeability of the material

b) The length of the magnetic path

c) The voltage applied to the circuit

d) The resistance of the material

Answer: a) The magnetic permeability of the material

35. The total magnetomotive force (MMF) in a parallel magnetic circuit is:

a) The sum of the individual MMFs

b) The average of the individual MMFs

c) The product of the individual MMFs

d) None of the above

Answer: a) The sum of the individual MMFs

36. In a magnetic circuit, the magnetic field lines tend to follow the path of:

a) Least resistance

b) Greatest resistance

c) Least reluctance

d) Greatest reluctance

37. The main purpose of a magnetic core in a magnetic circuit is to:

a) Increase the magnetic field strength

b) Decrease the magnetic flux

c) Provide a path for the magnetic flux

d) Generate an electromotive force

Answer: c) Provide a path for the magnetic flux

38. The magnetization curve of a magnetic material shows the relationship between:

a) Magnetic field strength and magnetic flux density

b) Magnetic permeability and magnetic reluctance

c) Magnetomotive force and magnetic flux

d) Magnetic field strength and magnetomotive force

Answer: a) Magnetic field strength and magnetic flux density

39. The concept of magnetic hysteresis refers to:

a) The loss of magnetic field strength over time

b) The dependence of magnetic flux on the magnetic field strength

c) The lagging of magnetic flux behind the magnetomotive force

d) The residual magnetism remaining in a material after the magnetizing force is removed

Answer: d) The residual magnetism remaining in a material after the magnetizing force is removed

40. The presence of air gaps in a magnetic circuit leads to:

a) Increased magnetic permeability

b) Increased magnetic field strength

c) Increased magnetic reluctance

d) Increased magnetic flux density

41. In a magnetic circuit, the total magnetic flux is determined by:

a) The magnetic field strength

b) The magnetic permeability

c) The magnetic reluctance

d) The magnetomotive force

42. The permeability of a material is a measure of its:

a) Magnetic field strength

b) Ability to conduct magnetic flux

c) Magnetic reluctance

d) Magnetization curve

Answer: b) Ability to conduct magnetic flux

43. The concept of magnetic saturation refers to:

a) The loss of magnetic field strength over time

b) The dependence of magnetic flux on the magnetic field strength

c) The lagging of magnetic flux behind the magnetomotive force

d) The point at which the magnetic material cannot be magnetized further

Answer: d) The point at which the magnetic material cannot be magnetized further

44. The magnetic circuit analysis is based on which fundamental law?

a) Ohm’s law

c) Ampere’s law

d) Coulomb’s law

45. The unit of magnetomotive force (MMF) is:

a) Tesla

b) Ampere

c) Henry

d) Weber

46. The reluctance of a magnetic circuit is directly proportional to:

a) Magnetic flux

b) Magnetic field strength

c) Magnetic permeability

d) Magnetomotive force

47. The magnetic field lines in a magnetic circuit tend to follow the path of:

a) Maximum magnetic field strength

b) Minimum magnetic field strength

c) Maximum magnetic permeability

d) Minimum magnetic permeability

48. The total magnetomotive force in a parallel magnetic circuit is equal to:

a) The sum of the individual magnetomotive forces

b) The average of the individual magnetomotive forces

c) The product of the individual magnetomotive forces

d) None of the above

Answer: b) The average of the individual magnetomotive forces

49. The concept of magnetic leakage refers to:

a) The loss of magnetic field strength over time

b) The dependence of magnetic flux on the magnetic field strength

c) The magnetic field lines that do not follow the desired path

d) The residual magnetism remaining in a material after the magnetizing force is removed

Answer: c) The magnetic field lines that do not follow the desired path

50. The magnetic reluctance of a magnetic circuit is inversely proportional to:

a) Magnetic field strength

b) Magnetic flux

c) Magnetic permeability

d) Magnetomotive force

51. Which law states that the magnetic flux linking a closed loop is directly proportional to the current flowing through the loop?

a) Ohm’s law

b) Ampere’s law

d) Lenz’s law

52. The property of a material that opposes the formation of magnetic flux is known as:

a) Magnetic permeability

b) Magnetic reluctivity

c) Magnetic resistance

d) Magnetic inductance

53. The unit of magnetic reluctivity is:

a) Tesla

b) Ampere

c) Henry

d) Permeability

54. The magnetomotive force (MMF) in a magnetic circuit is analogous to which quantity in an electrical circuit?

a) Voltage

b) Current

c) Resistance

d) Power

55. The reluctance of a magnetic circuit is determined by:

a) The magnetic field strength

b) The magnetic permeability

c) The length of the magnetic path

d) The cross-sectional area of the magnetic path

Answer: c) The length of the magnetic path

56. The magnetic circuit is closed when:

a) There is a gap in the magnetic path

b) The magnetic material is saturated

c) The magnetic field strength is zero

d) The magnetic permeability is infinite

Answer: d) The magnetic permeability is infinite

57. The energy stored in a magnetic circuit is given by:

a) 0.5 * H * B

b) 0.5 * B * H^2

c) 0.5 * B^2 * H

d) H * B

Answer: c) 0.5 * B^2 * H

58. The concept of magnetic coupling refers to:

a) The interaction between two magnetic circuits

b) The interaction between magnetic and electric fields

c) The interaction between magnetic and gravitational fields

d) The interaction between magnetic and thermal fields

Answer: a) The interaction between two magnetic circuits

59. The magnetic field strength (H) in a magnetic circuit is proportional to:

a) Magnetic flux

b) Magnetic permeability

c) Reluctance

d) Magnetomotive force

60. The magnetic field lines in a magnetic circuit are:

a) Closed loops

b) Straight lines

c) Vary in shape

d) Absent

61. The magnetic circuit is analogous to which component in an electrical circuit?

a) Resistor

b) Capacitor

c) Inductor

d) Transformer

62. The magnetic field strength in a magnetic circuit is determined by:

a) The current flowing through the circuit

b) The voltage applied to the circuit

c) The resistance of the circuit

d) The capacitance of the circuit

Answer: a) The current flowing through the circuit

63. The magnetic flux density is defined as:

a) The force experienced by a magnetic pole

b) The number of magnetic field lines passing through a surface per unit area

c) The product of magnetic field strength and magnetic permeability

d) The magnetomotive force per unit length

Answer: b) The number of magnetic field lines passing through a surface per unit area

64. In a series magnetic circuit, the total magnetic field strength is:

a) The sum of the individual field strengths

b) The average of the individual field strengths

c) The product of the individual field strengths

d) None of the above

Answer: a) The sum of the individual field strengths

65. The magnetic field intensity (H) inside a magnetic material is determined by:

a) The magnetic permeability of the material

b) The length of the magnetic path

c) The voltage applied to the circuit

d) The resistance of the material

Answer: a) The magnetic permeability of the material

66. The magnetic flux in a magnetic circuit is proportional to:

a) The magnetic field strength

b) The magnetic permeability

c) The reluctance

d) The magnetomotive force

67. The concept of magnetic hysteresis refers to:

a) The loss of magnetic field strength over time

b) The dependence of magnetic flux on the magnetic field strength

c) The lagging of magnetic flux behind the magnetomotive force

d) The residual magnetism remaining in a material after the magnetizing force is removed

Answer: d) The residual magnetism remaining in a material after the magnetizing force is removed

68. The magnetic circuit is open when:

a) There is a gap in the magnetic path

b) The magnetic material is saturated

c) The magnetic field strength is zero

d) The magnetic permeability is infinite

Answer: a) There is a gap in the magnetic path

69. The main purpose of a magnetic core in a magnetic circuit is to:

a) Increase the magnetic field strength

b) Decrease the magnetic flux

c) Provide a path for the magnetic flux

d) Generate an electromotive force

Answer: c) Provide a path for the magnetic flux

70. The magnetization curve of a magnetic material shows the relationship between:

a) Magnetic field strength and magnetic flux density

b) Magnetic permeability and magnetic reluctance

c) Magnetomotive force and magnetic flux

d) Magnetic field strength and magnetomotive force

Answer: a) Magnetic field strength and magnetic flux density

71. The unit of magnetic flux is:

a) Tesla

b) Ampere

c) Henry

d) Weber

72. The magnetomotive force (MMF) is defined as:

a) The product of magnetic field strength and magnetic flux density

b) The number of magnetic field lines passing through a surface per unit area

c) The force experienced by a magnetic pole

d) The magnetic field strength times the length of the magnetic path

Answer: d) The magnetic field strength times the length of the magnetic path

73. The magnetic reluctance of a magnetic circuit is directly proportional to:

a) Magnetic field strength

b) Magnetic flux

c) Magnetic permeability

d) Magnetomotive force

74. The concept of magnetic saturation refers to:

a) The loss of magnetic field strength over time

b) The dependence of magnetic flux on the magnetic field strength

c) The lagging of magnetic flux behind the magnetomotive force

d) The point at which the magnetic material cannot be magnetized further

Answer: d) The point at which the magnetic material cannot be magnetized further

75. The magnetic field lines in a magnetic circuit tend to follow the path of:

a) Maximum magnetic field strength

b) Minimum magnetic field strength

c) Maximum magnetic permeability

d) Minimum magnetic permeability

76. The total magnetic flux in a series magnetic circuit is:

a) The sum of the individual fluxes

b) The average of the individual fluxes

c) The product of the individual fluxes

d) None of the above

Answer: a) The sum of the individual fluxes

77. The permeability of a material is a measure of its:

a) Magnetic field strength

b) Ability to conduct magnetic flux

c) Magnetic reluctance

d) Magnetization curve

Answer: b) Ability to conduct magnetic flux

78. The main purpose of magnetic shielding in a magnetic circuit is to:

a) Prevent leakage of magnetic flux

b) Increase the magnetic field strength

c) Decrease the magnetomotive force

d) Change the magnetic permeability of the material

Answer: a) Prevent leakage of magnetic flux

79. The energy stored in a magnetic circuit is given by:

a) 0.5 * H * B

b) 0.5 * B * H^2

c) 0.5 * B^2 * H

d) H * B

Answer: c) 0.5 * B^2 * H

80. The magnetic field intensity (H) in a magnetic circuit is proportional to:

a) Magnetic flux

b) Magnetic permeability

c) Reluctance

d) Magnetomotive force