KINDLY ANSWER ALL THE 15 THEORY QUESTIONS GIVEN BELOW, SHORT (3-5) LINES ANSWERS WILL DO. THANK YOU

(PLEASE DO NOT ANSWER HALF OR A FEW OF THEM !!!)

Question 1: In the wave equation below, what does the sign of the phase represent?

y(x, t) = A cos(t x + ₀)

Answer 1:

When its value is positive, ₀ signifies a phase lead in time, and when it is negative, it signifies a phase lag. (((The question is not about the wave velocity or direction where the signs of and are important)))

Question 2: Why is it that the base vectors (x, y, z ) are independent of the location of a point, but r and are not?

Answer 2:

Question 3: Why do we use more than one coordinate system?

Answer 3:

Question 4: What are the major differences between the electric force F_e and the magnetic force F_m?

Answer 4:

Question 5: Two infinitely long parallel wires carry currents of equal magnitude. What is the resultant magnetic field due to the two wires at a point midway between the wires, compared with the magnetic field due to one of them alone, if the currents are (a) in the same direction and (b) in opposite directions?

Answer 5:

Question 6: Explain Faradays law and the function of Lenzs law.

Answer 6:

Question 7: When conduction current flows through a material, a certain number of charges enter the material on one end and an equal number leave on the other end. What is the situation like for the displacement current through a perfect dielectric?

Answer 7:

Question 8: How does the envelope of the wave pattern vary with distance in (a) a lossless medium and (b) a lossy medium?

Answer 8:

Question 9: If a TEM wave is traveling in the y direction, can its electric field have components along x, y and z ? Explain.

Answer 9:

Question 10: In the radar radome design of Example 8-1 (slides of Lecture 8), all the incident energy in medium 1 ends up getting transmitted into medium 3, and vice versa. Does this imply that no reflections take place within medium 2? Explain.

Answer 10:

Question 11: Explain, on the basis of boundary conditions, why it is necessary that = 1 at the boundary between a dielectric and a perfect conductor.

Answer 11:

Question 12: What does it mean to say that most antennas are reciprocal devices?

Answer 12:

Question 13: In a Hertzian dipole, what is the underlying assumption about the current flowing through the wire?

Answer 13:

Question 14: Explain how the pattern multiplication principle is used to compute the radiation pattern of an antenna array.

Answer 14:

Question 15: Why is frequency scanning an attractive technique for steering the beam of an antenna array?

Answer 15: