Electromagnetic theory miscellaneous
- An antenna, when radiating, has a highly directional radiation pattern. When the antenna is receiving, its radiation pattern—
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The radiation pattern of the antenna will be the same while radiating as well as receiving.
Correct Option: C
The radiation pattern of the antenna will be the same while radiating as well as receiving.
- The intrinsic impedance of a lossy dielectric medium is given by—
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The intrinsic impedance of a lossy dielectric medium is given by
η = jωμ σ + jωε Correct Option: C
The intrinsic impedance of a lossy dielectric medium is given by
η = jωμ σ + jωε
- 160. Match the following:
(A) ∇ × H = J
(B) ƒOs E·dl = –d/dt ƒs B·ds
(C) ∇ · J = –δρ/∇t
1. Continuity equation
2. Faraday's law
3. Ampere's law
4. Gauss's law
5. Biot-Savart law
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NA
Correct Option: D
NA
- For a dipole antenna—
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In a dipole antenna radiation is almost nil along its axis and maximum in a direction perpendicular to its axis.
Correct Option: A
In a dipole antenna radiation is almost nil along its axis and maximum in a direction perpendicular to its axis.
- A plane electromagnetic wave travelling along +z-direction, has its electric field given by Ex = 2 cos (t) and Ey = 2 cos (t + 90) the wave is—
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Ex = 2 cos ωt,
Ey = 2 cos (ωt + 90º)
= – 2 sin ωt
Ey/ Ex = – tan ωt
This is a left circularly polarized wave.Correct Option: C
Ex = 2 cos ωt,
Ey = 2 cos (ωt + 90º)
= – 2 sin ωt
Ey/ Ex = – tan ωt
This is a left circularly polarized wave.