Download GTU B.Tech 2020 Winter 4th Sem 3140912 Electromagnetic Fields Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 4th Sem 3140912 Electromagnetic Fields Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?IV (NEW) EXAMINATION ? WINTER 2020
Subject Code:3140912 Date:11/02/2021
Subject Name:Electromagnetic Fields
Time:02:30 PM TO 04:30 PM Total Marks:56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Explain cylindrical coordinate system in brief.
03
(b) Explain Electrical dipole.
04
(c) Explain spherical coordinate system and give the relationship between Cartesian
07
and spherical coordinate system.

(d)


Q. 2 (a) State and explain Coulomb's law.
03
(a) State and explain the Gauss's law.
04
(b) Obtain equation for flux density due to infinite line charge using Gauss's law.
07


Q.3 (a) Define displacement current and current density.
03
(b) Derive the point form of the continuity equation.
04
(c) Obtain the Expression for field intensity H at the center of a circular carrying
07
current I, using Biot-Savart law.


Q.4 (a) Explain concept of dot product and cross product.
03
(b) Explain phenomenon of polarization.
04
(c) Discuss Poisson's and Laplace equation.
07


Q.5 (a) Classify magnetic materials.
03
(b) Explain the physical significance of the term: Curl of a vector.
04
(c) Derive Maxwell's equation in integral and Point form.
07


Q.6 (a) Explain difference between steady magnetic field and time varying magnetic
03
field.
(b)
Define divergence.
04
()
(c) Explain Stoke's theorem with its mathematical expression.
07



Q.7 (a) Explain concept of electric potential difference.
03
(b) State and explain Ohm's law in point form.
04
(c) Explain boundary conditions between two perfect dielectric materials.
07


Q.8 (a) Explain concept of scalar magnetic potential and magnetic vector potential.
03
(b) Explain Electrical field as the Gradient of the electrical potential.
04
(c) State and explain ampere's circuit law, both in integral differential form as used
07
in magnetic field.
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