Electromagnetic Field Theory - Study Mode

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[#136] If the electric field strength of a plane wave is 12 V/m. What will be the strength of magnetic field in free space-

(A) 0.04 A/m

(B) 0.03 A/m

(C) 0.02 A/m

(D) 0.01 A/m

Correct Answer

(B) 0.03 A/m

[#137] According to Ampere's circuital Law the line integral of H about any closed path is exactly . . . . . . . . to the direct current enclosed by that path.

(A) Double

(B) Equal

(C) 4 Times

(D) Half

Correct Answer

(B) Equal

[#138] Consider an interface between two dielectric materials, one with ε r = 2 while the other has ε r = 5. If the tangential component of electric field on one side of the interface has a magnitude of 10 V.m -1 . What is the magnitude of the tangential component of electric field on the other side?

(A) 10 V.m -1

(B) 20 V.m -1

(C) 2 V.m -1

(D) 5 V.m -1

Correct Answer

(A) 10 V.m -1

[#139] At a frequency of 1 GHz, the equivalent inductance between the terminals of a $$frac{lambda }{8}$$ (λ represents wavelength) short-circuited lossless 50 Ω line is

(A) $$frac{5}{pi }{ ext{nH}}$$

(B) $$frac{{15}}{pi }{ ext{nH}}$$

(C) $$frac{{25}}{pi }{ ext{nH}}$$

(D) $$frac{{50}}{pi }{ ext{nH}}$$

Correct Answer

(C) $$frac{{25}}{pi }{ ext{nH}}$$

[#140] A plane electromagnetic wave travelling in a perfect dielectric medium of characteristic impedance η 1 is incident normally on its boundary with another perfect dielectric medium of characteristic impedance η 2 . The electric and magnetic field strengths of the incident wave are denoted by E 1 and H 1 respectively whereas E r and H r denote these quantities for the reflected wave, and E t and H t for the transmitted wave. Which of the following relations are correct? 1. E i = η 1 H i 2. E r = η 1 H r 3. E t = -η 2 H t Select the correct answer using the options given below:

(A) 1, 2 and 3

(B) 1 and 2

(C) 1 and 3

(D) 2 and 3

Correct Answer

(C) 1 and 3