### 75+ Electromagnetism MCQ of Basic Electrical Engineering

1. What is the magnetic field outside a solenoid?
a) Infinity
b) Half the value of the field inside
c) Double the value of the field inside
d) Zero

2. Which, among the following qualities, is not affected by the magnetic field?
a) Moving charge
b) Change in magnetic flux
c) Current flowing in a conductor
d) Stationary charge

3. When a charged particle moves at right angles to the magnetic field, the variable quantity is?
a) Momentum
b) Speed
c) Energy
d) Moment of inertia

4. If the flow of electric current is parallel to the magnetic field, the force will be ______
a) Zero
b) Infinity
c) Maximum
d) Half the original value

5. The ratio of magnetic force to electric force on a charged particle getting undeflected in a field is?
a) 1
b) 0
c) 2
d) 4

6. What is the strength of magnetic field known as ________
a) Flux
b) Density
c) Magnetic strength
d) Magnetic flux density

These are 50+ Electromagnetism MCQ

7. Weakest force in nature is?
a) Electric force
b) Gravitational force
c) Weak force
d) Magnetic force

8. How can a magnetic field be produced?
a) Using a permanent magnet
b) Electric current
c) Using a temporary magnet
d) Using a permanent magnet or electric current

9. Can we see magnetic flux lines?
a) Yes
b) No
c) Depends on the strength of the field
d) Only when the field strength is very large

10. Magnetic Field lines move from _______
a) North to south
b) South to north
c) West to east
d) East to west

11. Field lines move from __________
a) North to south
b) South to north
c) West to east
d) East to west

12. Magnetic field lines ___________ at the north pole.
a) Emerge
b) Converge
c) Neither emerge nor converge
d) Either emerge or converge

13. Magnetic field lines ___________ at the south pole.
a) Emerge
b) Converge
c) Neither emerge nor converge
d) Either emerge or converge

14. Which of the following is used to determine the direction of magnetic field in a current carrying conductor?
a) Left hand thumb rule
b) Right hand thumb rule
c) Right hand palm rule
d) Left hand palm rule

15. According to Flemming’s left hand rule, the index finger denotes?
a) Direction of magnetic field
b) Direction of current
c) Direction of force
d) Direction of force as well as current

16. According to Flemming’s left hand rule, the middle finger denotes?
a) Direction of magnetic field
b) Direction of current
c) Direction of force
d) Direction of force as well as current

17. According to Flemming’s left hand rule, the thumb denotes?
a) Direction of magnetic field
b) Direction of current
c) Direction of force
d) Direction of force as well as current

18. The relation between the direction of force and the direction of magnetic field is _________
a) Same direction
b) Opposite direction
c) Perpendicular
d) Unrelated

19. The relation between the direction of current and the direction of magnetic field is ________
a) Same direction
b) Opposite direction
c) Perpendicular
d) Unrelated

20. The relation between the direction of current and the direction of the force is _________
a) Same direction
b) Opposite direction
c) Perpendicular
d) Unrelated

21. Magnetic field lines seek the path of __________ resistance.
a) Maximum
b) Minimum
c) Infinite
d) Zero

22. Magnetic field lines form _________ loops from pole to pole.
a) Open
b) Closed
c) Branched
d) Either closed or branched

23. Do magnetic flux lines intersect?
a) Yes
b) No
c) Depends on the situation
d) Cannot be determined

24. Inside the magnet, field lines travel from?
a) North to south
b) South to north
c) West to east
d) East to west

25. Lines of magnetic flux which are parallel and in the same direction __________ each other.
a) Attract
b) Repel
c) Intersect
d) Cancel

26. More the number of magnetic flux lines _______ is the force of the magnet.
a) Greater
b) Lesser
c) Either greater or lesser
d) Neither greater nor lesser

27. Magnetic field is strong when____________
a) magnetic field lines are closer
b) magnetic field lines are farther
c) magnetic field lines are longer
d) magnetic field lines are thicker

28. The force existing between two infinite parallel conductors is inversely proportional to ________
b) Current in one of the conductors
c) The product of the current in the two conductors
d) The distance between the two conductors

29. When the distance of operation between the two conductors increases, what happens to the force between the two conductors?
a) Increases
b) Decreases
c) Remains the same
d) Becomes zero

30. Magnetic field at a point d distance away from long wire due to electric current i in it is ____________
a) µ0i/2r
b) µ0i/r
c) µ0i/2πr
d) µ0i/πr

31. The force per unit length existing between two infinite parallel conductors is given by ___________
a) µ0i1i2/2πd
b) µ0i1i2/2d
c) µ0i1/2πdi2
d) µ0i1i2/d

32. If the radius of the current carrying conductor increases, what is the effect on the force?
a) increases
b) decreases
c) remain same
d) become zero

33. If current of conductor increases, what is the effect on the force?
a) increases
b) decreases
c) remain same
d) become zero

34. If length of current carrying conductor increases, what is the effect on the force?
a) increases
b) decreases
c) remain same
d) become zero

35. The magnetic field strength of a solenoid can be increased by inserting which of the following materials as the core?
a) Copper
b) Silver
c) Iron
d) Aluminium

36. If a coil is wound around a steel core and electric current is passed through the coil, the steel core acts as a?
a) Electromagnet
b) Permanent magnet
c) Neither electromagnet nor permanent magnet
d) Either electromagnet or permanent magnet

For more visit PROGIES homepage

37. What is the formula for the magnetic field due to a solenoid?
a) μnI
b) μn2
c) μNI
d) μN2I2

38. What happens to the magnetic field in the solenoid when the number of turns increases?
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero

39. What happens to the magnetic field in the solenoid when the current increases?
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero

40. What happens to the magnetic field in the solenoid when the length of the solenoid increases?
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero

41. The current in a solenoid is 30A, the number of turns per unit length is 500 turns per metre. Calculate the magnetic field if the core is air.
a) 18.84T
b) 18.84mT
c) 1.84T
d) 1.84mT
These are 50+ Electromagnetism MCQ

42. The magnetic field of the solenoid is 18.84mT, the number of turns per unit length is 500 turns per metre. Calculate the current if the core is air.
a) 300A
b) 30A
c) 3A
d) 300mA

43. The magnetic field of the solenoid is 18.84mT, the current is 30A. Calculate the number of turns per unit length if the core is air.
a) 1500 turns/m
b) 1000 turns/m
c) 500 turns /m
d) 2000 turns/m

44. What is the expression for force in a current carrying conductor?
a) F=K/r2
b) F=Kq/r2
c) F=Kq1q2/r2
d) F=Kq1q2/r

45. Force in a conductor is__________ to the product of the charges.
a) Directly proportional
b) Inversely proportional
c) Not related
d) Cannot be determined

46. Force in a conductor is __________ to the square of the distance between the charges.
a) Directly proportional
b) Inversely proportional
c) Not related
d) Cannot be determined

47. Calculate the force between two charges having magnitude 3nC and 2nC separated by a distance of 2micro m.
a) 13.5N
b) 13.5kN
c) 1.35N
d) 1.35kN

48. If the flow of electric current is parallel to the magnetic field, the force will be?
a) Zero
b) Infinity
c) Maximum
d) Half the original value

49. The ratio of magnetic force to electric force on a charged particle getting undeflected in a field is ______
a) 1
b) 0
c) 2
d) 4

50. Weakest force in nature is __________
a) Electric force
b) Gravitational force
c) Weak force
d) Magnetic force

These are 50+ Electromagnetism MCQ

51. The relation between the direction of force and the direction of magnetic field is __________
a) Same direction
b) Opposite direction
c) Perpendicular
d) Unrelated

52. The relation between the direction of current and the direction of the force is ________
a) Same direction
b) Opposite direction
c) Perpendicular
d) Unrelated

53. Which among the following, is the correct expression for force in a current carrying conductor if magnetic field is perpendicular to it?
a) F=Bi
b) F=B2il
c) F=Bil
d) F=Bl2

54. When the current in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?
a) Increases
b) Decreases
c) Remains the same
d) Becomes zero
These are 50+ Electromagnetism MCQ

55. When the length of the conductor in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?
a) Increases
b) Decreases
c) Remains the same
d) Becomes zero

56. When the magnetic field intensity in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?
a) Increases
b) Decreases
c) Remains the same
d) Becomes zero

57. The unit for force in a current carrying conductor is _________
a) Tesla*Ampere*metre
b) Tesla
c) Ampere/metre
d) Ampere*metre

58. If net force is zero on a particle in magnetic field what is relation between velocity and magnetic field?
a) v=E*B
b) v=E/B
c) v=B/E
d) v=1/(E*B)

59. If the intensity of the magnetic field is 100T, the length of the conductor is 10m and the magnitude of force perpendicular to the magnetic field is 10kN,calculate the current in the conductor.
a) 100 A
b) 100 mA
c) 10 A
d) 10 mA
These are 50+ Electromagnetism MCQ

60. If the intensity of the magnetic field perpendicular to current carrying conductor is 100T, the length of the conductor is 3m and the current in the conductor is 10A, calculate the magnitude of force perpendicular to the electric field.
a) 300N
b) 30N
c) 30kN
d) 3kN

61. Force in current carrying conductor placed in magnetic field is ___________ of il and B.
a) dot product
b) scalar product
c) cross product

62. An E.M.F. can be induced by _________
a) Change in the magnetic field only
b) Change in the area of cross section only
c) Change in angle between magnetic field and area only
d) Change in the magnetic field, area or angle between them

63. What happens to the current in a coil while accelerating a magnet inside it?
a) Increases
b) Decreases
c) Remains constant
d) Reverses

64. What is the consequence of motor effect?
a) Current
b) Voltage
c) Electromagnetic induction
d) EMF

65. The total number of magnetic field lines passing through an area is termed as?
a) Voltage
b) EMF
c) Magnetic flux
d) Magnetic flux density

66. The formula for induced emf if magnetic field, length and velocity of conductor all are mutually perpendicular is __________
a) emf=B2l
b) emf=Bil
c) emf=Blv
d) emf=B2v

These are 50+ Electromagnetism MCQ

67. If a conductor 0.2m long moves with a velocity of 0.3m/s in a magnetic field of 5T, calculate the emf induced if magnetic field, velocity and length of conductor are mutually perpendicular to each other.
a) 0.3V
b) 0.03V
c) 30V
d) 3V

These are 50+ Electromagnetism MCQ

68. Find the length of a conductor which is moving with a velocity 0.4m/s in a magnetic field of 8T, inducing an emf of 20V if magnetic field, velocity and length of conductor are mutually perpendicular to each other.
a) 50m
b) 5m
c) 6.25m
d) 0.5m

69. Find the strength of the magnetic field in a conductor 0.5m long moving with a velocity of 10m/s, inducing an emf of 20V if magnetic field, velocity and length of conductor are mutually perpendicular to each other.
a) 1T
b) 2T
c) 3T
d) 4T

70. What does emf stand for?
a) Electronic magnetic force
b) Electromotive force
c) Electromagnetic force
d) Electromated force

71. What is emf?
a) Force
b) Voltage
c) Current
d) Flux

72. According to Faraday’s laws of electromagnetic induction, an emf is induced in a conductor whenever?
a) The conductor is perpendicular to the magnetic field
b) Lies in the magnetic field
c) Cuts magnetic lines of flux
d) Moves parallel to the magnetic field

73. Direction of induced emf is determined by __________
a) Fleming’s left hand rule
b) Fleming’s right hand rule
d) Right hand thumb rule

74. “The direction of an induced e.m.f. is always such that it tends to set up a current opposing the motion or the change of flux responsible for inducing that e.m.f.”, this is the statement for?
a) Fleming’s left hand rule
b) Fleming’s right hand rule
d) Lenz’s law

75. According to Fleming’s right hand rule, the thumb points towards?
a) Current
b) E.M.F.
c) Motion of the conductor
d) Magnetic flux

76. According to Fleming’s right hand rule, the index finger points towards?
a) Current
b) E.M.F.
c) Motion of the conductor
d) Magnetic flux

77. According to Fleming’s right hand rule, the middle finger points towards?
a) Current
b) E.M.F.
c) Motion of the conductor
d) Magnetic flux

78. The relation between the direction of induced emf and the direction of motion of the conductor is?
a) Parallel
b) Equal
c) Not related
d) Perpendicular

79. The relation between the direction of induced emf and the direction of magnetic flux is _______
a) Parallel
b) Equal
c) Not related
d) Perpendicular

80. The relation between the direction of magnetic flux and the direction of motion of the conductor is _______
a) Parallel
b) Equal
c) Not related
d) Perpendicular

* The material and content uploaded on this website are for general information and reference purposes only. Please do it by your own first. COPYING MATERIALS IS STRICTLY PROHIBITED.

Check more here : https://progies.in/100-current-electricity-questions

50+ Electromagnetism MCQ.

Check out more ……..