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Electromagnetic Fields PTU Paper

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  • Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Question Paper

Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Question Paper

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  • Categories Electromagnetic Fields PTU Paper
  • Date January 20, 2016
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Download Previous Year PTU University Question  Paper of Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Question Paper

B.Tech. (EE-2011 Batch)

Electromagnetic Fields

Subject Code : BTEE-403           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.

Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper

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Section a Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Paper              

Define electric flux density. What is its physical significance?

Electric flux density. What is its physical significance

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?

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?



How is Gauss’s law useful in determining the E field intensity of a charge distribution?

Gauss’s law useful in determining the E field intensity of a charge distribution

What is the fundamental difference between static electric and magnetic field lines?

Fundamental difference between static electric and magnetic field lines

Write Laplace’s equation in cylindrical coordinates.

Laplace’s equation in cylindrical coordinates.

How is the H field immediately outside a perfect conducting surface determined?

How is the H field immediately outside a perfect conducting surface determined

What do you understand by equipotential surfaces?

Equipotential surfaces

What is the physical significance of poynting vector?

Physical significance of poynting vector

What are the properties associated with an electromagnetic wave travelling through free space?

Properties associated with an electromagnetic wave travelling through free space

Define surface impedance.

Surface impedance.

Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper

Section B :Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Paper              

What do you mean by polarization of dielectric materials when subjected to static fields?

Polarization of dielectric materials when subjected to static fields

Explain electrical conductivity of metal. Explain the necessity of alloy materials.

Electrical conductivity of metal. Explain the necessity of alloy materials.

Explain the term superconductivity. Explain the effect of temperature of magnetic flux.

Superconductivity. Explain the effect of temperature of magnetic flux.

Explain the characteristics of magnetic materials used for electrical apparatus.

Characteristics of magnetic materials used for electrical apparatus.

Explain why, Curie Law was modified to Curie-Weiss Law?

Why, Curie Law was modified to Curie-Weiss Law

Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Question Paper 

Electro magnetic Fields 4th Sem B.Tech PTU April 2013 Question Paper

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Section c :-Electromagnetic Fields 4th Sem B.Tech PTU April 2013 Question Paper              

Derive the Clausius-Mosotti relation for dielectric materials and hence deduce Lorentz-Lorenz equation.

Clausius-Mosotti relation for dielectric material

Deduce Lorentz-Lorenz equation.

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.

(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.

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.

(iii) velocity of an electron with the Fermi energy.

(iv) the mean free path of the electrons.

(iv) the mean free path of the electrons.

Explain ferromagnetic domains. Explain B-H curves for power transformer and induction motor design.

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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