Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ME (Mechanical Engineering) 2020 March 1st and 2nd Sem Electromagnetism Previous Question Paper
Roll No. Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (Mechanical Engg.) (2018 & Onwards) (Sem.?1,2)
B.Tech.(Automobile Engg.)/(CE)/(CSE)/
(Electrical & Electronics Engg.)/(ME)
ELECTROMAGNETISM
Subject Code : BTPH-103-18
M.Code : 75357
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 & C. have FOUR questions each.
3. Attempt any FIVE questions from SECTION B & C carrying EIGHT marks each.
4. Select atleast TWO questions from SECTION - B & C.
SECTION-A
Write briefly :
1. What is the significance of negative sign in the equation E = ? ? V ? If a potential V is
known at a point, can we find the electric field by using E = ? ? V ?
2. Show that electric potential function x
2
? y
2
+ z satisfies Laplace?s equation.
3. What is uniqueness theorem? Explain.
4. Discuss the physical meaning of the Maxwell?s equation . 0 B ? ?
? ?
.
5. What is physical significance of magnetic susceptibility?
6. Define skin depth of a conductor. What is the value of skin depth for a perfect
conductor?
7. What is a plane wave?
8. State Faraday?s law of electromagnetic induction. Is Lenz?s law contained in it?
9. Light is mostly characterised by electric field vector even though it has magnetic field
vector also. Why?
10 What is the justification of choosing the earth as the zero of potential in practice?
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1 | M-75357 (S1)-1585
Roll No. Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (Mechanical Engg.) (2018 & Onwards) (Sem.?1,2)
B.Tech.(Automobile Engg.)/(CE)/(CSE)/
(Electrical & Electronics Engg.)/(ME)
ELECTROMAGNETISM
Subject Code : BTPH-103-18
M.Code : 75357
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 & C. have FOUR questions each.
3. Attempt any FIVE questions from SECTION B & C carrying EIGHT marks each.
4. Select atleast TWO questions from SECTION - B & C.
SECTION-A
Write briefly :
1. What is the significance of negative sign in the equation E = ? ? V ? If a potential V is
known at a point, can we find the electric field by using E = ? ? V ?
2. Show that electric potential function x
2
? y
2
+ z satisfies Laplace?s equation.
3. What is uniqueness theorem? Explain.
4. Discuss the physical meaning of the Maxwell?s equation . 0 B ? ?
? ?
.
5. What is physical significance of magnetic susceptibility?
6. Define skin depth of a conductor. What is the value of skin depth for a perfect
conductor?
7. What is a plane wave?
8. State Faraday?s law of electromagnetic induction. Is Lenz?s law contained in it?
9. Light is mostly characterised by electric field vector even though it has magnetic field
vector also. Why?
10 What is the justification of choosing the earth as the zero of potential in practice?
2 | M-75357 (S1)-1585
SECTION-B
11. The distance between H
+
and Cl
?
ions in HCL molecule is 1.28?. Find the potential due
to this dipole at a distance 12? on a line making an angle of 60? with the axis of dipole.
12. Why electric field inside a dielectric decreases due to polarization? Show that
0
, D E P ? ? ?
? ? ?
where the symbols has their usual meanings.
13. Explain the term vector potential. Using the concept of vector potential, deduce Biot-
Savart law.
14. Distinguish between diamagnetic, paramagnetic and ferromagnetic substances. Give their
important properties.
SECTION-C
15. Show that Faraday?s law of electromagnetic induction can be expressed in the differential
form
B
E
t
?
? ? ?
?
?
? ?
. Discuss the physical meaning of this equation.
16. State and prove Poynting theorem. Explain physical meaning of each term involved in
expression.
17. Prove by mathematical analysis that electromagnetic waves are transverse in nature.
18. A plane electromagnetic wave is incident normally at the boundary of two media of
impedance Z
1
and Z
2
. Discuss the phenomenon of reflection and transmission.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 21 March 2020