The displacement flux density at a point on the surface of a perfect conductor i

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Question
The displacement flux density at a point on the surface of a perfect conductor is = 2(a_x - 3 a_z)c/m² pointing away from the surface. The charge density at that point c/m² will be
Options
A. 2
B. - 2
C. 4
D. - 4

Correct Answer

4

Explanation

? . D = r.

Electromagnetic Field Theory problems

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2. Consider a 300 ?, quarter wave long at 1 GHz transmission line as shown in figure. It is connected to a 10 V, 50 ? source at one end is left open circuited at the other end. The magnitude of the voltage at the open circuit end of the line is
Options
A. 10 V
B. 5 V
C. 60 V
D. 60/7 volt

3. A plane wave is characterized by the wave is
Options
A. linearly polarized
B. circularly polarized
C. elliptically polarized
D. unpolarized

4. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.
Options
A. 3 x 10⁸ m/sec
B. 5 x 10⁸ m/sec
C. 1.5 x 10⁸ m/sec
D. 9 x 10⁸ m/sec

5. For F₁ layer the maximum ionic density is 2.3 x 10⁴ electrons per cc. The critical frequency for this layer will be
Options
A. 1.36 MHz
B. 13.6 MHz
C. 136 MHz
D. 1360 MHz

6. The velocity of electromagnetic wave in a good conductor is
Options
A. 3 x 10⁸ m/s
B. more than 3 x 10⁸ m/s
C. very low
D. high

7. Which one of the following does represents the electric field lines for the TE₀₂ mode in the cross section of a hollow rectangular metallic waveguide?
Options
A.
B.
C.
D.

8. A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its Brewster angle is
Options
A. 0�
B. 30�
C. 45�
D. 60�

9. For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the value of propagation constant P will be
Options
A. 15.9 radians/km
B. 31.8 radians/km
C. 63.6 radians/km
D. 105.4 radians/km

10. The Depth of penetration of EM wave in medium having conductivity ? at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be
Options
A. 6.25 cm
B. 12.50 cm
C. 50 cm
D. 100 cm

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