**B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011.**

**Third Semester**

**Electrical and Electronics Engineering**

**EE 2202 — ELECTROMAGNETIC THEORY**

**(Regulation 2008)**

**Time : Three hours Maximum : 100 marks**

**Answer ALL questions.**

**PART A — (10 × 2 = 20 marks)**

**1. Define Divergence.**

**2. State Divergence theorem.**

**3. What is meant by equipotential surface?**

**4. Electric field is conservative field. Justify.**

**5. What is the point form of Ampere’s Circuital Law?**

**6. Distinguish scalar and Vector Magnetic Potential.**

**7. Give Lorentz force equation.**

**8. Compare circuit and field theory**

**9. What are the standing waves?**

**10. Give the applications of wave guides.**

**PART B — (5 × 16 = 80 marks)**

**Or**

**(b) Explain in detail line, surface and volume integrals of vector functions.**

**12. (a) Apply Gauss’s law to an**

**(i) infinite line charge**

**(ii) infinite sheet of charge.**

**Or**

**(b) (i) Derive Potential distribution in a coaxial conductor.**

**(ii) The interface between a dielectric medium having relative permittivity 4 and free space is marked the y = 0 plane. If the electric field next to the interface in the free space region is**

**given by determine E field on the other side of the interface.**

**13. (a) Derive the boundary conditions to explain the behavior of magnetic**

**field at the interface of two magnetic media.**

**Or**

**(b) Derive an expression for energy density in a magnetic field.**

**14. (a) Derive the Maxwell's equations is Integral and point forms.**

**Or**

**(b) (i) In a charge free non magnetic dielectric region, the magnetic field is given by**

**Calculate the dielectric constant of the medium and also the**

**displacement current density.**

**(ii) A conducting circular loop of radius ‘a has its centre at the**

**origin and its axis makes an angle θ with the z axis. The loop is**

**placed in a magnetic field**

**Z a ft B B ˆ . 2 cos**

**0 π =**

**r**

**Wb/m2**

**(1) Derive the expression for the induced voltage on the loop.**

**(2) If the peak to peak voltage is l6 mV at a frequency of 1 KHz when the loop lies in the xy plane, determine the loop radius given that = 0 B 10 mwb/m2**

**15. (a) Explain in detail the behavior of plane waves in lossless medium.**

**Or**

**(b) Explain Poynting Vector and Power Flow in Electromagnetic Fields.**

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