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Electromagnetic Theory

Important Questions

Part A Questions

Unit I

1. Define Electromagnetics.

2. Define Electrostatics.

3. Define Magnetostatics.

4. Define Field.

5. Define Scalar field and give an example.

6. Define Vector field and give an example.

7. Mention the source of electric and magnetic fields.

8. List any five sources of electromagnetic field.

9. Define unit vector.

10. What is the condition for any two vectors to be perpendicular?

11. What is the condition for any two vectors to be parallel?

12. State the condition for the vector F to be solenoidal.

13. State the condition for the vector F to be irrotational.

14. Prove that div(curlF)=0.

15. Prove that Curl(GradV)=0.

16. Define Divergence.

17. What is the physical significance of divergence of D?

18.Define Curl and write its significance.

19. Define Gradient and write its significance.

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20. State Divergence theorem.

21. State Stokes theorem.

22. Write the expression for dl, ds, dv in Cartesian, Cylindrical and Spherical Coordinates.

23.Obtain the expression for the volume of a sphere of radius a from the differential

volume.

Unit II

1. State Coulombs Law.

2. State Gauss Law for the Electric field.

3. Write the point and integral form of Electric Gauss Law.

4. State the boundary conditions for the electric field at the interface separating two

dielectrics.

5. Define Point Charge.

6. Define Electric Field intensity.

7. Define Electric Flux density.

8. Define Absolute Potential.

9. Define Electric Dipole and dipole moment.

10. Define Dielectric Polarization.

11. Define Dielectric strength.

12. Define Capacitance.

13. Define Conservative field.

14. Define energy density for electric field.

15. What are symmetrical charge distributions?

16. What is meant by Gaussian surface?

17.What is meant by equipotential surface?

18. Mention the characteristics of Perfect conductor.

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19. Write the relation between E and V.

20. Write the relation between D and E.

21. Mention the applications of Electric Gauss Law.

22. Write the point form of ohms Law.

23. Write the continuity equation.

24. What is meant by conduction current density?

25. Write Laplace and Poissons equations.

26. Derive capacitance of parallel plate capacitor.

Unit III

1. State Biot-Savarts Law.

2. State Amperes circuital Law.

3. Mention the applications of Amperes circuital law.4. State Gauss law for magnetic field.

5. Define Magnetic Flux density.

6. Define Magnetization.7. Define Inductance.

8. Define Scalar and Vector magnetic potential.

9. Write the Lorentz force equation.

10. Classify magnetic materials.11. State the magnetic boundary conditions.

12. Write the expression for the inductance of toroid.

13. Write the expression for the inductance of solenoid.14. Write the difference between solenoid and toroid.

15. Write the expression of H due to infinite sheet of current.

16. Write the expression for the magnetic field at the centre of the circular coil.17. Define magnetic moment.

18. Write the relation B and H.

19. Write the formula to find the force between two parallel current carrying conductors.20. Write the expression for the torque experienced by a current carrying loop situated in a

magnetic field.21. What is the energy density in magnetic field/

22. What is the expression for the energy stored in magnetic field?

Unit IV

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1. State Faradays Law of electromagnetic induction.

2. State Maxwells four equations in point form and integral form.

3. State the Lenzs Law.

4. Define Transformer and motional emf.

5. Define displacement current density.

6. Compare field theory with circuit theory.

7. Define loss tangent.

Unit IV

1. State Poyntings Theorem.

2. What is meant by pointing vector?

3. Define Skin depth.

4. Define Characteristics Impedance.

5. Define Standing wave ratio.

6. What are uniform plane waves?

7. Mention the characteristics of uniform plane waves.

8. Define reflection and transmission coefficients.

9. What will happen when the wave is incident obliquely over dielectric- dielectric

boundary?

10. Obtain the characteristics impedance of free space.

11. Define propagation constant.

12. Write down the wave equation for E and H in free space.