Electromagnetic Field Theory - Study Mode
[#26] From a solution of wave equation in a conducting medium we can determine various parameters. In the light of this, match List-I with List-II and select the correct answer using the options given below the lists: List-I (Parameter) List-II (Expression) a. Propagation constant 1. $${left( {frac{2}{{omega mu sigma }}}
ight)^{frac{1}{2}}}$$ b. Skin depth 2. $${left( {frac{{omega {mu _0}}}{{2sigma }}}
ight)^{frac{1}{2}}}$$ c. Sheet resistance 3. $${left( {jomega {mu _0}sigma }
ight)^{frac{1}{2}}}$$ 4. $${left( {frac{{omega {mu _0}sigma }}{2}}
ight)^{ - frac{1}{2}}}$$
Correct Answer
(B) a-3, b-1, c-2
[#27] The mode used in the laboratory bench is
Correct Answer
(A) Dominant mode
[#28] Consider a rectangular coordinate system (x, y, z) with unit vectors a x , a y and a z . A plane wave travelling in the region z ≥ 0 with electric field vector E = 10cos(2 × 10 8 t + βz)a y is incident normally on the plane at z = 0, where β is the phase constant. The region z ≥ 0 is in the free space and the region z < 0 is filled with a lossless medium (permittivity ε = ε 0 , permeability µ = 4µ 0 , where ε 0 = 8.85 × 10 12 F/m and µ 0 = 4π × 10 -7 H/m). The value of the reflection coefficient is
Correct Answer
(B) $$frac{1}{3}$$
[#29] If a right hand circularly polarised wave is incident on a perfect conductor. The reflected wave is:
Correct Answer
(B) Left circularly polarised wave
[#30] The maximum usable frequency of an ionospheric layer at 60° incidence at with 8 MHz critical frequency is
Correct Answer
(A) 16 MHz