Objective Questions on Maxwell’s Equations and Electromagnetic Waves
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Antenna Fundamental Parameters MCQ
Multiple Choice Questions
Q.1. Maxwell’s equations shelter on __________ law(s).
- Faraday’s
- Gauss’s
- Ampere’s
- All of these
Answer: All of these
Q.2. Conduction current through a wire is __________ displacement current in capacitor.
- Same as
- Different from
- Twice of
- None of these
Answer: Same as
Q.3. Absolute permeability of free space is
- 4π × 10-7 A/m
- 4π × 10-7 H/m
- 4π × 10-7 F/m
- 4π × 10-7 H/m2
Answer: 4π × 10-7 H/m
Q.4. For static magnetic field,
- ∇ × B = ρ
- ∇ × B = μJ
- ∇ × B = μ0J
- ∇ × B = 0
Answer: ∇ × B = μJ
Q.5. The time varying electric field is
- E = − ∇V
- E = − ∇V − Ȧ
- E = − ∇V – B
- E = − ∇V – D
Answer: E = − ∇V − Ȧ
Q.6. Maxwell’s third equation gives __________.
- \bigtriangledown \times \vec{H}=\vec{J_{d}}+\frac{\partial \rho }{\partial t}
- \bigtriangledown \cdot \vec{H}=J_{d}\frac{\partial \rho }{\partial t}
- \bigtriangledown \cdot \vec{H}=\vec{J_{d}}+\frac{\partial \rho }{\partial t}
- \bigtriangledown \times \vec{H}=J_{d}\frac{\partial \rho }{\partial t}
Answer: \bigtriangledown \times \vec{H}=\vec{J_{d}}+\frac{\partial \rho }{\partial t}
Q.7. Maxwell’s fourth equation gives __________.
- \bigtriangledown \cdot \vec{E}=-\frac{\partial \vec{B} }{\partial t}
- \bigtriangledown \times \vec{E}=-\frac{\partial \vec{B} }{\partial t}
- \bigtriangledown \cdot \vec{E}=\frac{\partial \vec{B} }{\partial t}
- \bigtriangledown \times \vec{E}=\frac{\partial \vec{B} }{\partial t}
Answer: \bigtriangledown \times \vec{E}=-\frac{\partial \vec{B} }{\partial t}
Q.8. In empty space, conduction current is __________.
- Infinity
- Unity
- Zero
- None of these
Answer: Zero
Q.9. As per Maxwell’s first equation __________.
- \bigtriangledown \times \vec{D}=\rho _{\nu }
- \bigtriangledown \cdot \vec{D}=\rho _{\nu }
- \bigtriangledown \times \vec{D}=\rho _{s }
- \bigtriangledown \cdot \vec{D}=\rho _{s }
Answer: \bigtriangledown \cdot \vec{D}=\rho _{\nu }
Q.10. Maxwell’s second equation gives __________.
- \bigtriangledown \times \vec{B}=0
- \bigtriangledown \cdot \vec{B}=0
- \bigtriangledown \times \vec{B}=1
- \bigtriangledown \cdot \vec{B}=1
Answer: \bigtriangledown \cdot \vec{B}=0
Q.11. emf is closed __________ integral of non-conservational electric field that is generated by battery.
- Line
- Surface
- Volume
- None of these
Answer: Line
Q.12. Maxwell’s equations in __________ form give unformation at points of discontinuity in electromagnetic fields.
- Differential
- Integral
- Algebraic
- None of these
Answer: Integral
Q.13. At the point of discontinuity, __________ component of magnetic flux density is continuous.
- Tangential
- Normal
- None of these
- Cannot say
Answer: Normal
Q.14. For those surfaces where surface charge density is __________ normal component of electric flux density is continuous.
- Infinity
- Unity
- Zero
- None of these
Answer: Zero
Q.15. Displacement current density ____________ current passing through a capacitor.
- Represents
- Does not represent
- Is the same as
- None of these
Answer: Does not represent
Q.16. Line integral of an electric field around a closed path is __________.
- Infinity
- Unity
- Zero
- None of these
Answer: Zero
Q.17. __________ are caused by accelerated charges.
- Time-varying fields
- Waves
- Both Time-varying fields & Waves
- None of these
Answer: Both Time-varying fields & Waves
Q.18. Maxwell’s equations give the relations between
- different fields
- different sources
- different boundary conditions
- none of these
Answer: different fields
Q.19. cosine of the angle between the two vectors is
- sum of the products of the directions of the two vectors
- difference of the products of the directions of the two vectors
- product of the products of the directions of the two vectors
- none of these
Answer: sum of the products of the directions of the two vectors
Q.20. The electric field intensity, E at a point (1, 2, 2) due to (1/9) nc located at (0, 0, 0) is
- 33 V/m
- 0.333 V/m
- 0.33 V/m
- Zero
Answer: 0.33 V/m
Q.21. If E is a vector, then ∇ . ∇ × E is
- 0
- 1
- does not exist
- none of these
Answer: 0
Q.22. For free space,
- σ = ∞
- σ =0
- J ≠ 0
- none of these
Answer: σ =0
Q.23. The electric field for time varying potentials
- E = − ∇V
- E = − ∇V – A
- E = ∇V
- E = − ∇V + A
Answer: E = − ∇V
Q.24. The intrinsic impedence of the medium whose σ = 0, ∈r = 9, μr = 1 is
- 40 πΩ
- 9 Ω
- 120 πΩ
- 60 πΩ
Answer: 40 πΩ
Q.25 For time varying EM fields
- ∇ × H = J
- ∇ × H = Ḋ + J
- ∇ × E = 0
- none of these
Answer: ∇ × H = Ḋ + J
Q.26. The wavelength of a wave with a propagation constant = 0.1π + j 0.2π is
- 10 m
- 20 m
- 30 m
- 25 m
Answer: 10 m
Q.27. The electric field just above a conductor is always
- normal to the surface
- tangential to source
- zero
- ∞
Answer: normal to the surface
Q.28. The normal components of D are
- continuous across a dielectric boundary
- discontinuous across a dielectric boundary
- zero
- ∞
Answer: continuous across a dielectric boundary
Q.29. If Jc = 1 mA/m2 in a medium whose conductivity is σ = 10 Mho/m, E is
- 0.1 V/m
- 10μ V/m
- 1.0μ V/m
- 10 V/m.
Answer: 0.1 V/m
Q.30. If Jd = 2 mA/m2 in a medium whose ∈r = 2, σ= 4.95 Mho/m at a frequency of 1 GHz, Jc is
- 8.9 mA/m2
- 89 mA/m2
- 0.89 mA/m2
- 89 A/m2
Answer: 89 mA/m2