Electromagnetic Field Theory MCQ Questions & Answers | ECE

The magneto-motive force is

When the phase velocity of an electromagnetic wave depends on frequency in any medium, the phenomenon is called

Gauss theorem is expressed mathematically as:

"The surface integral of curl of a vector field over an open surface equals the line integral of the vector field over the closed curve bounding the surface area" this is the statement of-

A very reliable service has to be established between two points on earth separated by 1000 km. The band that will be used is

What is the magnitude of emf induced in a 200 turn coil with cross-sectional area of 0.16 m², if the magnetic field through the coil changes from 0.10 Wb/m² to 0.50 Wb/m² at a uniform rate over a period of 0.02 seconds?

The characteristic impedance of a lossless transmission line is given by

Consider the following statements regarding the load matching and impedance measurements:
1. A mismatched load can be properly matched to a line by inserting prior to the load a transmission line $$\frac{\lambda }{4}$$ long.
2. For matching of 120 Ω load to a 75 Ω line, the quarter-wave transformer must have a characteristic impedance of 190 Ω.
3. The main disadvantage of single-stub matching is that it is a narrow-band or frequency-sensitive device.
Which of the above statements are not correct?

What is the minimum value of VSWR that may exist on a transmission line?

The electric field around a positive charge is