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Electromagnetic Field Theory MCQ Questions & Answers | ECE

Learn Electromagnetic Field Theory MCQ questions & answers are available for a Electronics and Communications Engineering(ECE) students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Electromagnetic Field Theory MCQ question is the important chapter for a Electronics and Communications Engineering(ECE) and GATE students. Page-5 section-2

Each section contains 100 MCQs on Electromagnetic Field Theory .
41
The electric field component of a wave in free space is given by E = 50sin(107t + kz)$${\hat j}$$ V/m. Which one of the following is the correct inference that can be drawn from this expression?
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Answer: Option B
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42
The current flowing through a wire of length 2.5 cm is 100 A. If wire is bent into a square, magnetizing force at the centre of square is
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Answer: Option A
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43
If the potential, V = 4x + 2 volts, the electric field is:
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Answer: Option D
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44
Poynting vector P = E × H has the unit
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Answer: Option A
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45
Consider the following
For a lossless transmission line, we can write:
1. Zin = -jZ0 for a shorted line with $$l$$ = λ/8
2. Zin = ±j∞ for a shorted line with $$l$$ = λ/4
3. Zin = -jZ0 for an open line with $$l$$ = λ/2
4. Zin = Z0 for a matched line of any length
Select the correct answer using the options given below:
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Answer: Option D
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46
VSWR of a purely resistive load of normalized value n + j0 for n < 1 is:
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Answer: Option B
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47
The wave length of a 100 MHz electromagnetic wave propagating through a perfect non-magnetic dielectric with relative permittivity εr = 9 is
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Answer: Option C
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48
Match List-I with List-II for a transmission line with a series impedance Z = R + jωLΩ/m and a shunt admittance Y = G + jωC mho/m, and select the correct answer:
List-I (Parameters) List-II (Values)
a. Characteristic impedance Z0 1. $$\sqrt {{\text{ZY}}} $$
b. Propagation constant γ 2. $$\sqrt {\frac{{\text{Z}}}{{\text{Y}}}} $$
c. The sending-end input impedance ZS when the line is terminated in its characteristic impedance Z0 3. $$\sqrt {\frac{{\text{Y}}}{{\text{Z}}}} $$
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Answer: Option C
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49
Refraction of radio waves in the atmosphere results due to:
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Answer: Option C
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50
The electric field on the surface of a perfect conductor is 2 V/m. The conductor is immersed in water with ∈ = 80 ∈0. The surface charge density on the conductor is $$\left( { \in = \frac{{{{10}^{ - 9}}}}{{36\pi }}} \right){\text{F/m}}$$
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Answer: Option D
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