Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Question Paper
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B.Tech. (EE-2011 Batch)
Electromagnetic Fields
Subject Code : BTEE-403Â Â Â Â Â Â Paper ID : [ A1206]
Time : 3 Hrs.             Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Question Paper SECTION-A
Q1. Write Briefly
  a. Define electric flux density. What is its physical significance?
  b. In a ring of eight equal charges, q, placed equally in a circle of radius R if one charge is removed, what is the magnitude of electric potential at point P located in the center of circle?
  c. How is Gauss’s law useful in determining the E field intensity of a charge distribution?
  d. What is the fundamental difference between static electric and magnetic field lines?
  e. Write Laplace’s equation in cylindrical coordinates.
  f. How is the H field immediately outside a perfect conducting surface determined?
  g. What do you understand by equipotential surfaces?
  h. What is the physical significance of poynting vector?
   i. What are the properties associated with an electromagnetic wave travelling through free space?
  j. Define surface impedance.
                   SECTION-B
Q2. Attempt any five questions.                                  5×6=30
   2. What do you mean by polarization of dielectric materials when subjected      to static fields?
   3. Explain electrical conductivity of metal. Explain the necessity of alloy         materials.
   4. Explain the term superconductivity. Explain the effect of temperature of        magnetic flux.
   5. Explain the characteristics of magnetic materials used for electrical           apparatus.
   6. Explain why, Curie Law was modified to Curie-Weiss Law?
                   SECTION-C
Q3. Attempt any three questions.                            3×10=30
   7. Derive the Clausius-Mosotti relation for dielectric materials and hence         deduce Lorentz-Lorenz equation.
   8. A conduction wire has a resistivity of 2.04 × 10–8 ohm-m at room              temperature. The Fermi energy for such a conductor is 5.8ev. There are
     5.8 × 1028 conduction electrons per m3. Calculate :
   (i) the mobility and relaxation time of the electrons.
  (ii) the average drift velocity of the electrons when the electric field applied       to the conductor is 1.1 V per m.
  (iii) velocity of an electron with the Fermi energy.
  (iv) the mean free path of the electrons.
   9. Explain ferromagnetic domains. Explain B-H curves for power                transformer and induction motor design.
Electric flux density. What is its physical significance
A ring of eight equal charges, q, placed equally in a circle of radius R if one charge is removed, what is the magnitude of electric potential at point P located in the center of circle?
Gauss’s law useful in determining the E field intensity of a charge distribution
Fundamental difference between static electric and magnetic field lines
Laplace’s equation in cylindrical coordinates.
How is the H field immediately outside a perfect conducting surface determined
Equipotential surfaces
Physical significance of poynting vector
Properties associated with an electromagnetic wave travelling through free space
Surface impedance.
Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper
Polarization of dielectric materials when subjected to static fields
Electrical conductivity of metal. Explain the necessity of alloy materials.
Superconductivity. Explain the effect of temperature of magnetic flux.
Characteristics of magnetic materials used for electrical apparatus.
Why, Curie Law was modified to Curie-Weiss Law
Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Question PaperÂ
Clausius-Mosotti relation for dielectric material
Deduce Lorentz-Lorenz equation.
(i) the mobility and relaxation time of the electrons.
The average drift velocity of the electrons when the electric field applied to the conductor is 1.1 V per m.
(iii) velocity of an electron with the Fermi energy.
(iv) the mean free path of the electrons.
Ferromagnetic domains.
Explain B-H curves for power transformer and induction motor design.
Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Question Paper
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