Electromagnetic Field Theory MCQ Questions & Answers | ECE

A medium of relative permittivity ε_r2 = 2 form an interface with free-space. A point source of electromagnetic energy is located in the medium at depth of 1 meter from the interface. Due to the total internal reflection, the transmitted beam has a circular cross-section over the interface. The area of the beam cross-section at the interface is given by

Two ceramic capacitors have the following parameters. One has capacitance C₁ and ceramic thickness d₁. The other has capacitance C₂ and ceramic thickness d₂. When the two are connected in parallel, the combination has a capacitance of

The electric field component of a uniform plane wave propagating in a lossless magnetic dielectric medium is given by $$\overrightarrow E \left( {t,\,z} \right) = {{\hat a}_x}5\cos \left( {{{10}^9}t - \frac{{20}}{3}z} \right){\text{V/m}}{\text{.}}$$       If η₀ represents the intrinsic impedance of the free space, the corresponding magnetic field component is given by

A small current carrying circular loop lies on a vertical plane. P is a point of observation on the orthogonal vertical plane passing through the centre of the loop and θ is the angle between O and OP as shown in the given figure. The θ component of the H-field will vary as:

Equation of the plane passing through the point \[3\overrightarrow i - \overrightarrow j + \overrightarrow k \]   and perpendicular to the vector \[4\overrightarrow i + 2\overrightarrow j - \overrightarrow k \]   is

The divergence of the magnetic flux density B is given as:

Consider the following statements regarding a plane wave propagating through free space:
The direction of field
1. 'E' is perpendicular to the direction of propagation
2. 'H' is perpendicular to the direction of propagation
3. 'E' is perpendicular to the direction of field 'H'
Which of these statements are correct?

A transmission line has characteristic impedance of 500 Ω. It has been terminated in a 200 Ω load. If the load is dissipating a continuous power of 100 W, its reflection coefficient is

Which of the following statement is correct?

Consider the following statements regarding impedance matching:
1. When the line is terminated in an impedance other than its characteristic impedance, reflection will occur and there will be standing waves of voltage and current along the line which may be very large if there is considerable mismatch.
2. The single-stub device has the advantage that it will match any load.
3. The double stub has the disadvantage that the line length needs to be adjustable.
Which of the above statements are correct?