Gujarat Technological UniversitySummer 2026 examination

GTU BE04000301 Electromagnetics Summer 2026 Question Paper & PDF

B.E. · EC Engineering · Semester 4 · Subject code BE04000301
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 10:30 AM – 1:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks

Represent spherical coordinate system with neat sketch indicating coordinates and unit vectors & write differential lengths, areas and volume.

(b)
4 marks

Two vectors extending from origin are v1= (7,3,-2) and v2= (-2,7,-3) then find (a) a unit vector perpendicular to both v1 and v2 (b) area of triangle defined by v1 and v2.

(c)
7 marks

An infinite long uniform line charge with density 30 nC/m is lying along y=3 and z=5. Determine E at point P (5,6,1) due to this line charge.

Q.2

14 Marks
(a)
3 marks
Define divergence of a vector A and briefly explain it with examples.
(b)
4 marks

Calculate the work done in moving a 3 C charge from B(1,3,5) to A(2,0,3) along the straight-line segments joining (1,3,5) to (2,3,5) to (2,0,5) to (2,0,3) in the electric field E = y ax V/m.

(c)
7 marks

A volume is defined by 1< x,y,z < 1.2 in free space. If D = 2x2y ax + 3x2y2 ay C/m² then determine total flux leaving the closed surface using Gauss’s law.

(c)
7 marks
Describe boundary conditions at conductor-free space interface.

Q.3

14 Marks
(a)
3 marks
State and prove divergence theorem.
(b)
4 marks

Calculate volume charge density using poisson’s equation if potential at point P(1,2,3) is given by V =4yz/(1+x2) Volts.

(c)
7 marks

Three infinite uniform sheet charges are located in free space as 3 nC/m² at z= - 4, 6 nC/m² at z=1 and -8 nC/m² at z=4. Then find electric field at point P(-1,-5,2).

(a)
3 marks

Find equation of streamline passing through point P(1,4,-2) in the field E = (-8x/y)ax + (4x2/y2)ay .

(b)
4 marks
Calculate ∇ · D at point P(-2,3,5) if D= 1/z2[10xyz ax + 5x2z ay + (2z3 – 5x2y) az].
(c)
7 marks

Apply Gauss’s law to a differential volume and derive its point form as maxwell’s first equation.

Q.4

14 Marks
(a)
3 marks

If V= (v0. ρ /d).cosϕ in cylindrical system then check wheter it satisfies Laplace equation or not.

(b)
4 marks
State significance of Poisson’s and Laplace equations and derive them.
(c)
7 marks
Discuss boundary conditions for dielectric-dielectric interface.
(a)
3 marks
Define: magnetic flux density, scalar magnetic potential, vector magnetic potential.
(b)
4 marks
State and explain Stoke’s theorem.
(c)
7 marks
Define curl of vector A and derive point form of Ampere’s circuital law.

Q.5

14 Marks
(a)
3 marks
Briefly explain retarded potential.
(b)
4 marks
State Faraday’s law and derive its point form.
(c)
7 marks

Write Maxwell’s equations in point form for static and time varying conditions and state their significance.

(a)
3 marks
Briefly explain displacement current.
(b)
4 marks
Describe wave motion in free space.
(c)
7 marks
Define poynting vector and derive its theorem.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Electromagnetics (Summer 2026, B.E. · EC Engineering, Sem 4). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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