EC2253 Electromagnetic Fields Question Bank : kings.ac.in

Name of the College : Kings College Of Engineering
Department : Electronics & Communication Engineering
Subject : Electromagnetic Fields
Website : kings.ac.in
Document Type : Question Bank

Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/ki…C%20FIELDS.pdf

Kings Electromagnetic Fields Question Bank

UNIT- I

Static Electric Fields :
Part-A :(2 Marks)
1. Describe what are the source of electric field and magnetic fields?
2. What is a scalar quantity?
3. What is a vector quantity?

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4. Define vector product of two vectors.
5. Find the dot product of the vectors A and B if A =2ax-3ay+4az, B= -ax+2ay+2az.
6. Write down expression for x,y,z in terms of spherical co-ordinates r
7. Represent point P (0, 1, 1) m given in Cartesian co-ordinates in spherical co-ordinates.
8. Give any three co ordinate systems.
9. Express the value of differential volume in rectangular and cylindrical co-ordinate systems.
10. Write expression for differential length in cylindrical and spherical co- ordinates.
11. What is physical significance of divergence of D?
12. Express the divergence of a vector in the three system of orthogonal Co-ordination.
13. State divergence theorem.
14. State Stoke’s theorem.
15. How is the unit vectors defined in three co ordinate systems?

UNIT- II

Static Magnetic Field :
Part-A (2 Marks)
1. Define Lorentz law of force.
2. State Biot-Savart Law.
3. State Ampere’s circuital law.
4. What is the difference between scalar and vector magnetic potential.
5. Define Magnetic Moment.
6. What is magnetic dipole moment?
7. Can a magnetic field exist in a good conductor if it is static or time varying? Explain.
8. Define magnetic vector potential.

UNIT- III

Electric And Magnetic Fields In Materials :
Part-A : (2 Marks)
1. Write the Poisson’s and Laplace equations.
2. Obtain Poisson’s equation from Gauss’s law
3. What is displacement current?
4. What is a capacitor?
5. Define Magnetic dipole.
6. What is magnetic dipole moment?
7. Define magnetization.
8. Define magnetic susceptibility.
9. What is the relation between relative permeability and susceptibility?
10. What are the different types of magnetic materials?
11. Define magnetic flux?
12. Define mmf?
13. Define Reluctance and permeance?
14. State the boundary conditions at the interface between two perfect dielectrics.
15. Write down the magnetic boundary conditions.
16. Write the point form of Ohm’s law.
17. Define self inductance.
18. Define Mutual inductance.

UNIT- IV

Time Varying Electric And Magnetic Fields :
1. State Faraday’s law of induction.
2. State lenz’s law
3. Give the equation of transformer emf
4. What is motional electric field?
5. What is motional emf?
6. What is the emf produced by moving loop in time varying field?
7. What is time harmonic field?
8. Give time harmonic Maxwell’s equation in point form. Assume time factor e-it.
9. Distinguish between Field theory and Circuit theory
10. Write Maxwell’s equation in point and integral form for good conductors.
11. What is significance of displacement current density?

12. In a material for which = 5s/m and r= 1 and E=250 sin 1010t (V/m).find the conduction and displacement current densities.
13. Define Poynting vector.
14. State Poynting Theorem.

UNIT- V

Electromagnetic Waves
1. Define a Wave.
2. Mention the properties of uniform plane wave.
3. Write down the wave equation for E and H in free space.
4. Write down the wave equation for E and H in a conducting medium.
5. Define intrinsic impedance or characteristic impedance.
6. Calculate the characteristic impedance of free space.
7. Define propagation constant.
8. Define skin depth
9. What is lossy dielectric medium?
10. For a loss dielectric material having µr=1, r=48, =20s/m. calculate the propagation constant at a frequency of 16 GHz
11. Define Polarization.
12. Define Circular Polarization.
13. Define Elliptical polarization.
14. Define Linear Polarization.

PART-B (16 Marks)
1. A plane wave propagating through a medium with r=8, µr=2 has E=0.5 sin (108t-
z) az v/m.
Determine
(ii) The loss tangent
(iii) wane impedance
(iv) wave velocity
(v) magnetic field (16)

2. Derive a wave equation for non dissipative medium making use of Maxwell equations and field vectors E and H. (16)
3. A plane sinusoidal electromagnetic wave traveling in space has Emax=150µV/m.
(i)Find the accompanying Hmax
(ii)Propagation is in X direction and H is oriented in Y direction. What is the direction of E.
(iii) Compute the average power transmitted. (16)
4. Define wave. Derive the free space electromagnetic wave equation. (16)
5. Discuss about the plane waves in lossy dielectrics. (16)
6. Discuss about the plane waves in lossless dielectrics. (16)
7. Briefly explain about the wave incident
(i) Normally on perfect conductor
(ii) Obliquely to the surface of perfect conductor. (16)