Electric and Magnetic Field Analysis MCQs

1. Which law describes the relationship between a static electric charge and the electric field it creates?

A) Ampère’s Law
B) Gauss’s Law
C) Faraday’s Law
D) Ohm’s Law
Answer: B) Gauss’s Law

2. The SI unit of electric field intensity is:

A) Volt
B) Ampere
C) Ohm
D) Volt per meter
Answer: D) Volt per meter

3. Electric field lines around a point charge:

A) Originate from the charge and terminate at infinity
B) Originate from the charge and terminate at another opposite charge
C) Originate from infinity and terminate at the charge
D) Originate from two opposite charges and form a closed loop
Answer: A) Originate from the charge and terminate at infinity

4. According to Gauss’s Law, the electric flux through a closed surface surrounding a charge is proportional to:

A) The charge enclosed by the surface
B) The area of the surface
C) The distance from the charge to the surface
D) The inverse square of the charge
Answer: A) The charge enclosed by the surface

5. The electric field inside a conductor in electrostatic equilibrium is:

A) Zero
B) Constant
C) Variable
D) Infinite
Answer: A) Zero

6. What is the relationship between electric potential (V) and electric field (E)?

A) V=1EV = \frac{1}{E}V=E1​
B) $V=E$
C) E=VdE = \frac{V}{d}E=dV​
D) E=−dVdrE = -\frac{dV}{dr}E=−drdV​
Answer: D) E=−dVdrE = -\frac{dV}{dr}E=−drdV​

7. Magnetic field lines:

A) Always form closed loops
B) Always start from north and end at south poles
C) Can start or end freely
D) Are one-dimensional
Answer: A) Always form closed loops

8. The SI unit of magnetic flux density (magnetic field strength) is:

A) Tesla
B) Weber
C) Gauss
D) Henry
Answer: A) Tesla

9. According to Ampère’s Law, the line integral of the magnetic field around a closed loop is proportional to:

A) The charge enclosed by the loop
B) The current enclosed by the loop
C) The magnetic field strength
D) The area of the loop
Answer: B) The current enclosed by the loop

10. In a uniform magnetic field, the magnetic force on a moving charged particle is greatest when the particle’s velocity is:

A) Perpendicular to the magnetic field
B) Parallel to the magnetic field
C) Antiparallel to the magnetic field
D) At an angle of 45 degrees to the magnetic field
Answer: A) Perpendicular to the magnetic field

11. The right-hand rule for magnetic fields states that if you point your thumb in the direction of the current in a straight wire, the direction of the magnetic field around the wire is:

A) Toward the thumb
B) Away from the thumb
C) Along the fingers
D) Opposite to the fingers
Answer: C) Along the fingers

12. Magnetic monopoles, as predicted by theoretical physics, would be:

A) Particles with only north or south magnetic poles
B) Particles with electric charges but no magnetic poles
C) Particles with gravitational poles but no magnetic poles
D) Non-existent based on current theories
Answer: D) Non-existent based on current theories

13. The force on a current-carrying conductor in a magnetic field is zero when the angle between the current direction and the magnetic field is:

A) 0 degrees
B) 45 degrees
C) 90 degrees
D) 180 degrees
Answer: C) 90 degrees

14. The phenomenon of electromagnetic induction is based on:

A) The production of magnetic field due to an electric current
B) The production of electric field due to a changing magnetic field
C) The generation of both electric and magnetic fields simultaneously
D) The annihilation of electric and magnetic fields
Answer: B) The production of electric field due to a changing magnetic field

15. Lenz’s Law is a consequence of which principle?

A) Conservation of energy
B) Conservation of charge
C) Conservation of momentum
D) Conservation of angular momentum
Answer: A) Conservation of energy

16. A coil of wire with 500 turns experiences a change in magnetic flux of 0.02 Wb in 0.1 seconds. What is the induced EMF in the coil?

A) 100 V
B) 10 V
C) 5 V
D) 1 V
Answer: C) 5 V

17. Mutual induction refers to the phenomenon where:

A) A changing current in one coil induces a current in another nearby coil
B) A changing magnetic field induces an electric field in a nearby conductor
C) Two conductors carry currents in opposite directions
D) The magnetic field generated by one coil influences the current in the same coil
Answer: A) A changing current in one coil induces a current in another nearby coil

18. Which material shows the highest magnetic permeability?

A) Air
B) Iron
C) Copper
D) Aluminum
Answer: B) Iron

19. In an alternating current (AC) circuit, the impedance of a capacitor:

A) Increases with frequency
B) Decreases with frequency
C) Remains constant with frequency
D) Is independent of frequency
Answer: A) Increases with frequency

20. The formula for the self-inductance (L) of a coil is:

A) L=NΦIL = \frac{N \Phi}{I}L=INΦ​
B) L=NΦIL = \frac{N \Phi}{I}L=INΦ​
C) L=ΦNIL = \frac{\Phi}{NI}L=NIΦ​
D) L=NΦIL = \frac{N \Phi}{I}L=INΦ​
Answer: A) L=NΦIL = \frac{N \Phi}{I}L=INΦ​

21. A magnetic dipole consists of:

A) A single north or south magnetic pole
B) A current loop or a pair of poles
C) A coil with a varying magnetic field
D) A material with high magnetic susceptibility
Answer: B) A current loop or a pair of poles

22. The magnitude of the magnetic force on a moving charged particle is given by:

A) $F=qvB\sin \theta$
B) $F=qvB\cos \theta$
C) F=qvBsin⁡θF = \frac{q v B}{\sin \theta}F=sinθqvB​
D) F=qvBcos⁡θF = \frac{q v B}{\cos \theta}F=cosθqvB​
Answer: A) $F=qvB\sin \theta$

23. A current-carrying conductor placed perpendicular to a magnetic field experiences:

A) Maximum force
B) Minimum force
C) No force
D) Circular motion
Answer: A) Maximum force

24. Which of the following statements about magnetic shielding is correct?

A) Magnetic shielding reduces the strength of a magnetic field
B) Magnetic shielding increases the strength of a magnetic field
C) Magnetic shielding only affects electric fields
D) Magnetic shielding is not possible
Answer: A) Magnetic shielding reduces the strength of a magnetic field

25. The Hall effect is used to measure:

A) Electric field strength
B) Magnetic field strength
C) Electric current
D) Electron density
Answer: B) Magnetic field strength

26. The phenomenon of magnetic hysteresis is most commonly associated with:

A) Ferromagnetic materials
B) Paramagnetic materials
C) Diamagnetic materials
D) Superconducting materials
Answer: A) Ferromagnetic materials

27. The direction of the magnetic field inside a solenoid carrying current is:

A) Along the axis of the solenoid, from one end to the other
B) Along the axis of the solenoid, from the other end to one end
C) Radially outward from the solenoid
D) Radially inward toward the axis of the solenoid
Answer: A) Along the axis of the solenoid, from one end to the other

28. The magnetic flux through a surface is maximum when the angle between the magnetic field and the normal to the surface is:

A) 0 degrees
B) 45 degrees
C) 90 degrees
D) 180 degrees
Answer: A) 0 degrees

29. The unit of magnetic pole strength (magnetic moment) is:

A) Tesla
B) Weber
C) Ampere-turn meter
D) Weber per square meter
Answer: C) Ampere-turn meter

30. In a cyclotron, charged particles are accelerated using:

A) Electric fields
B) Magnetic fields
C) Both electric and magnetic fields
D) Gravitational fields
Answer: C) Both electric and magnetic fields

31. Which of the following is a scalar quantity in the context of electromagnetic fields?

A) Electric field intensity
B) Magnetic flux density
C) Electric potential
D) Magnetic field strength
Answer: C) Electric potential

32. Magnetic resonance imaging (MRI) utilizes the phenomenon of:

A) Magnetic induction
B) Nuclear magnetic resonance
C) Paramagnetism
D) Magnetic hysteresis
Answer: B) Nuclear magnetic resonance

33. The force between two parallel current-carrying conductors is attractive when the currents flow in:

A) The same direction
B) Opposite directions
C) Perpendicular directions
D) At an angle of 45 degrees to each other
Answer: A) The same direction

34. An electric dipole consists of:

A) A single electric charge
B) Two equal and opposite electric charges separated by a small distance
C) A varying electric field
D) A conductor with high electric resistance
Answer: B) Two equal and opposite electric charges separated by a small distance

35. The relation between the electric field and the electric potential (V) at a point in space is:

A) E=VdE = \frac{V}{d}E=dV​
B) E=−dVdrE = -\frac{dV}{dr}E=−drdV​
C) E=1VE = \frac{1}{V}E=V1​
D) E=dVdrE = \frac{dV}{dr}E=drdV​
Answer: B) E=−dVdrE = -\frac{dV}{dr}E=−drdV​

36. Magnetic field lines around a bar magnet:

A) Always start from the north pole and end at the south pole
B) Always start from the south pole and end at the north pole
C) Originate from a single pole and terminate at infinity
D) Originate and terminate randomly on the magnet surface
Answer: A) Always start from the north pole and end at the south pole

37. The magnetic field inside a long solenoid carrying current is:

A) Zero
B) Varies along the axis of the solenoid
C) Uniform and directed along the axis of the solenoid
D) Non-uniform and directed along the axis of the solenoid
Answer: C) Uniform and directed along the axis of the solenoid

38. According to Lenz’s Law, the direction of an induced current in a conductor is such that it opposes:

A) The original magnetic field
B) The change in magnetic field
C) The original current in the conductor
D) The voltage applied across the conductor
Answer: B) The change in magnetic field

39. The energy stored in an inductor is given by the formula:

A) E=12LI2E = \frac{1}{2} L I^2E=21​LI2
B) E=12LIE = \frac{1}{2} L IE=21​LI
C) E=12L2I2E = \frac{1}{2} L^2 I^2E=21​L2I2
D) E=12L2IE = \frac{1}{2} L^2 IE=21​L2I
Answer: A) E=12LI2E = \frac{1}{2} L I^2E=21​LI2

40. A changing electric field produces a(n):

A) Changing magnetic field
B) Static magnetic field
C) Electric current
D) Electrostatic field
Answer: A) Changing magnetic field

41. The phenomenon of electromagnetic waves was predicted by:

A) Michael Faraday
B) James Clerk Maxwell
C) Nikola Tesla
D) Thomas Edison
Answer: B) James Clerk Maxwell

42. The speed of light in vacuum is approximately:

A) 3,000,000 m/s
B) 30,000 m/s
C) 300,000,000 m/s
D) 300 m/s
Answer: C) 300,000,000 m/s

43. In a transformer, the primary and secondary coils are usually wound around a common:

A) Iron core
B) Copper core
C) Aluminum core
D) Plastic core
Answer: A) Iron core

44. An electromagnetic wave consists of oscillating:

A) Electric fields only
B) Magnetic fields only
C) Both electric and magnetic fields perpendicular to each other
D) Both electric and magnetic fields parallel to each other
Answer: C) Both electric and magnetic fields perpendicular to each other

45. The phenomenon of electromagnetic induction is primarily associated with the work of:

A) Michael Faraday
B) Albert Einstein
C) Isaac Newton
D) Galileo Galilei
Answer: A) Michael Faraday

46. Magnetic domains in ferromagnetic materials align themselves:

A) Randomly
B) According to the applied magnetic field
C) Only at high temperatures
D) In the absence of any magnetic field
Answer: B) According to the applied magnetic field

47. The principle behind a transformer is based on:

A) Faraday’s Law of Electromagnetic Induction
B) Lenz’s Law
C) Coulomb’s Law
D) Archimedes’ Principle
Answer: A) Faraday’s Law of Electromagnetic Induction

48. The primary function of a commutator in a DC motor is to:

A) Change AC to DC current
B) Control the speed of the motor
C) Reverse the direction of current in the motor’s coil
D) Maintain the rotation of the motor
Answer: C) Reverse the direction of current in the motor’s coil

49. A material that has no permanent magnetic dipole moment is classified as:

A) Ferromagnetic
B) Paramagnetic
C) Diamagnetic
D) Superparamagnetic
Answer: C) Diamagnetic

50. The phenomenon of electromagnetic waves interacting with matter, resulting in a change of direction and speed, is called:

A) Diffraction
B) Refraction
C) Reflection
D) Interference
Answer: B) Refraction

More MCQs on Electrical Engineering (Power) MCQs

1. Power System Instrumentation
2. Optimization Techniques in Power Systems MCQs
3. Computational Methods in Power Engineering MCQs
4. Computational Methods MCQs
5. HVDC (High Voltage Direct Current) Systems MCQs
6. Electric Vehicles and Charging Infrastructure MCQs
7. Battery Storage Systems MCQs
8. Power Emerging Technologies MCQs
9. Distributed Generation MCQs
10. Microgrid Design and Control MCQs
11. Smart Grids and Microgrids MCQs
12. Transformers MCQs
13. Advanced Electrical Machines MCQs
14. Electrical Machine Design MCQs
15. Electrical Machines MCQs
16. Demand Side Management MCQs
17. Energy Efficiency and Audits MCQs
18. Energy Management Systems MCQs
19. Energy Management and Systems MCQs
20. Electric and Magnetic Field Analysis MCQs
21. Electromagnetisc Compatibility MCQ
22. Electromagnetic Fields and Applications MCQs
23. Grid-Connected Renewable Energy Systems MCQs
24. Integration of Renewable Energy Systems MCQs
25. Renewable Energy Integration MCQs
26. Advanced Control Techniques MCQs
27. Digital Control Systems MCQs
28. Industrial Control Systems MCQs
29. Automatic Control Systems MCQs
30. Power Semiconductor Devices MCQs
31. Switching Power Supplies MCQs
32. Electric Drives MCQs
33. Power Electronics MCQs
34. Power Quality MCQs
35. Fault Analysis MCQs
36. Load Flow Analysis MCQs
37. Power System Stability and Control MCQs
38. Power System Analysis MCQs
39. Smart Grids MCQs
40. Power System Protection and Relaying MCQs
41. Distribution Systems MCQs
42. Transmission Line Theory MCQs
43. High Voltage Engineering MCQs
44. Geothermal MCQs
45. Biomass MCQs,
46. Wind MCQs,
47. Solar energy MCQs
48. Renewable Energy Sources MCQs
49. Hydro power MCQs )
50. Nuclear power MCQs,
51. Thermal power MCQs,
52. Conventional Power Generation MCQs
53. Electrical Engineering (Power) MCQs