II B.Tech I Semester Regular Examinations, December 2018
ELECTROMAGNETIC FIELDS
(EEE)
Time: 3 Hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B)
2. Answer ALL the question in Part-A
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3. Answer any FOUR Questions from Part-B
PART-A
1. a) State Coulomb’s Law. [2M]
b) Define Electric Potential. [2M]
c) Write Laplace’s equation in Cartesian Co-ordinates. [2M]
d) State Ampere’s Circuital Law. [2M]
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e) Define Magnetic dipole moment. [2M]
f) What is displacement current? [2M]
g) Define loss tangent. [2M]
PART-B
2. a) Three equal positive charges of 4x10-9 C each are located at three corners of a square, side 20cm. Determine the electric field intensity at the vacant corner point of square. [7M]
b) Define Electric field intensity and electric potential. Derive an expression for electric field intensity due to a line charge. [7M]
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3. a) Obtain the expressions for the energy stored and energy density in a capacitor. [7M]
b) Given the potential V = 10sin?cosf/r2, find the electric flux density D at (2, p/2, 0). [7M]
4. a) State and explain Biot-Savart’s Law. [7M]
b) Derive an expression for the magnetic field intensity on the axis of a circular loop carrying a steady current ‘I’. [7M]
5. a) Derive the boundary conditions at the interface between two magnetic materials having different permeabilities. [7M]
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b) Calculate the inductance of a solenoid of 2000 turns wound uniformly over a length of 500mm on a cylindrical paper tube of 40mm in diameter. The medium is air. [7M]
6. a) State and explain Faraday’s Laws of electromagnetic induction. [7M]
b) In a lossless dielectric medium, E = Em sin(?t - ßz) ay V/m. Find H. [7M]
7. a) Explain about the wave propagation in good conductors. [7M]
b) A 10 GHz plane wave travelling through free space has an amplitude Ex = 10 V/m. Find V, ? and H. [7M]
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