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Electromagnetics – Multiple Choice Questions (MCQs)

73. Which of the following is a passive component in electromagnetics?
- A. Antenna
- B. Waveguide
- C. Resistor
- D. All of the above
74. The continuity equation for charge states that:
- A. Charge is conserved
- B. Charge is created
- C. Charge is destroyed
- D. Charge flows continuously
75. The boundary condition for the tangential component of the magnetic field at the interface between two media with no surface current is that it is:
- A. Discontinuous
- B. Continuous
- C. Zero
- D. Infinite
76. The unit of magnetic field strength H is:
- A. Ampere-turn/meter
- B. Tesla
- C. Weber
- D. Ampere
77. The force between two point charges is inversely proportional to the square of the distance between them. This is known as:
- A. Ampere's Law
- B. Faraday's Law
- C. Coulomb's Law
- D. Gauss's Law
78. The velocity factor of a transmission line is always:
- A. Greater than 1
- B. Less than 1
- C. Equal to 1
- D. Dependent on frequency
79. A plane wave incident normally on a perfect conductor will result in:
- A. Total transmission
- B. Total absorption
- C. Total reflection
- D. Partial reflection
80. The quality factor (Q) of a resonant cavity is a measure of its:
- A. Energy storage capability
- B. Bandwidth
- C. Losses
- D. Impedance
81. Dielectric breakdown occurs when:
- A. The electric field exceeds a critical value
- B. The current exceeds a critical value
- C. The material becomes magnetic
- D. The temperature becomes too high
82. The concept of displacement current explains:
- A. Why capacitors conduct AC
- B. Why inductors oppose current changes
- C. The force between charges
- D. The generation of magnetic fields by time-varying electric fields
83. What is the purpose of impedance matching in transmission lines?
- A. To maximize power transfer
- B. To minimize reflections
- C. To reduce standing waves
- D. All of the above
84. The radiation intensity of an antenna is proportional to the:
- A. Power radiated
- B. Antenna gain
- C. Square of the electric field
- D. Antenna efficiency

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Electromagnetics – Multiple Choice Questions (MCQs)

73. Which of the following is a passive component in electromagnetics?

74. The continuity equation for charge states that:

75. The boundary condition for the tangential component of the magnetic field at the interface between two media with no surface current is that it is:

76. The unit of magnetic field strength H is:

77. The force between two point charges is inversely proportional to the square of the distance between them. This is known as:

78. The velocity factor of a transmission line is always:

79. A plane wave incident normally on a perfect conductor will result in:

80. The quality factor (Q) of a resonant cavity is a measure of its:

81. Dielectric breakdown occurs when:

82. The concept of displacement current explains:

83. What is the purpose of impedance matching in transmission lines?

84. The radiation intensity of an antenna is proportional to the:

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