Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 2151002 Engineering Electromagnetics Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:2151002 Date:22/01/2021
Subject Name:Engineering Electromagnetics
Time:10:30 AM TO 12:30 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) Transform the following vectors to spherical coordinates at the points
03
given:
Y = 10 a y . At point Q ( = 5, = 30? z = 4 )
(b) A field is given as G = [25 / (x2 + y2)](x a x + y a y ).
04
Find a unit vector in the direction of G at P(3, 4,-2) . Also find the angle
between G and ax at P
State the Biot Savart Law.
(c)
Express biot savart law in terms of differe
ntial current element dL, surface
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current density K and current density J.
Q.2 (a) Stat and explain in brief : The divergence theorem
03
(b) Determine an expression for the volume charge density associated with
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each D field: D = sin sin a r + cos sin a + cos a .
(c) Explain the term: Electric Flux Density.
07
Determine an equation for the electric fields due to volume charge
distribution.
Q.3 (a) Define potential and potential difference
03
(b) State conductor properties and its boundary condition.
04
(c) Define capacitance. State and explain the problem of the parallel plate
07
capacitor. Fine the expression for capacitance for parallel plate capacitor.
Q.4 (a) Define current and current density
03
(b) An electric field is expressed in rectangular coordinates by
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E =6 x2 a x+ 6 y a y +4 a z V/m. Find: (a) VM N if points M and N are
specified by M (2, 6,-1) and N (-3,-3, 2) ; (b) VM if V = 0 at Q(4,-2,-35)
(c) State the Nature of Dielectric Materials and Boundary Conditions for
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Perfect Dielectric Materials.
Q.5 (a) State the magnetic boundary conditions.
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(b) The point charge Q = 18nC has a velocity of 5?106 m/s in the direction
04
a = 0.60 a x +0.75 a y+0.30 a z . Calculate the magnitude of the force
exerted on the charge by the field: B = -3ax +4ay +6az mT
(c) Define CURL. Derive the expression of curl of magnetic field intensity
07
in rectangular co-ordinate.
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Q.6 (a) Find the magnetization M in a magnetic material where:
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= 1.8 ? 10-5 H/m and H = 120 A/m
(b) Define force and Torque on a close circuit.
04
(c) State the ampere's circuital law. Derive the expression for magnetic field
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intensity at any point for co-axial cable which carries the uniform
distribution of current.
Q.7 (a) Explain : Wave Polarization and Standing Wave Ratio
03
(b) State and explain Lorentz force equation .
04
(c) Derive MAXWELL's equation in point form.
07
Q.8 (a) State and explain faraday's law.
03
(b) Explain : The Retarded Potentials
04
(c) Evaluate a Poisson's and Laplace's Equations
07
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This post was last modified on 04 March 2021