۸ 03000EE302052002 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Sixth semester B.Tech examinations (S), September 2020

Course Code: EE302
Course Name: ELECTROMAGNETICS
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries 5 marks. Marks
1 Given the two points A (2, 3,-1) and 8 (4, 250, 120°). Find the Spherical (5)
coordinates of A and Cartesian coordinates of B.
2 Obtain Poisson’s equation from Gauss’s law (5)
Explain (i) scalar magnetic potential and (ii) vector magnetic potential (5)
4 Show that the displacement current through a parallel plate capacitor is equal 0 (5)

the conduction current / flowing in the external circuit.

5 A coaxial cable carries a ‏عل‎ voltage V and current 1. Show that the power flow is (5)
۷ using Poynting’s theorem.

6 In a transverse electromagnetic wave, electric field intensity is given by (5)
E=E,sSin(t-Bz)ay in free space, Sketch E and H at t=0.

7 Derive the expressions for attenuation constant and phase constant fora uniform (5)
plane wave propagating in a conducting medium.

8 In a non-magnetic medium, electric field intensity is E=4sin(22*10’t-0.8x)a, (5)
V/m. Find the relative permittivity and intrinsic impedance of the medium.

PART 8
Answer any two full questions, each carries10 marks.
9 പ Define divergence of a vector field. Explain its physical significance. (4)

T 1 ⋅ ⋅ ⋅ ⋅ ⋅∁ ⋅
b) Transform the vector F = =a, in spherical coordinates into a vector in Cartesian (6)

coordinates.
10 a) State and prove Stokes theorem. (5)
b) What is an electric dipole? Derive an expression for the electric field intensity at (5)
any point due to dipole.
11 a) State Gauss’s law. Using Gauss’s law, derive an expression for electric field (6)

intensity due to an infinite plane sheet of charge.

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