EC2253 Electromagnetic Fields B.E Model Question Paper : aalimec.ac.in

Name of the College : Aalim Muhammed Salegh College of Engineering
University : Anna University
Department : Electronics and Communication Engineering
Subject Code/Name : EC2253 Electromagnetic Fields
Degree : B.E
Year : II
Document Type : Model Question Paper
Website : aalimec.ac.in

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AALIMEC Electromagnetic Fields Model Question Paper

Paper – I

Part-A : (10X2=20)
1.State Divergence Theorem.
2.Find whether the following field is solenoid F=Xi-2Yj+Zk.
3.State BIOT-SAVART’s Law.

Related : Aalim Muhammed Salegh College of Engineering EC2251 Electronic Circuits B.E Model Question Paper : www.pdfquestion.in/1598.html

4.Give Ampere’s Circuital Law in point form.
5.Give the continuity equation of current. And give the physical importance of the equation .
6.Define Self Inductance
7.Give the four Maxwell’s equation in point form.
8.State Poynting theorem.
9.Define skin depth
10.Define Brewster’s Angle.

Part-B (5X16=80) :
11. (a) (i) Find the total electric field at the origin due to 10-8C charge located at P(4,0,4)m and a -0.5×10-8C charge at Q (2, 0, 2) m (8)
(ii) Derive the expression for the potential, electric field and torque due to dipole (8)
Or
(b) State and prove Gauss’s Law. Explain the variation of the electric field with respect to the radius of the sphere for the following geometries (16)
1) Single sphere of charge
2) Two Concentric shells of charge q1 and q2.
3) Spherical volume distribution of charge.

12. (a) (i) Using BIOT-SAVART’S Law, derive the magnetic field intensity of a circular disc along the axis of the disc. And deduce the equation to the center of the circular disc (8)
(ii) Derive the applications of Ampere’s Circuital Law (8)
Or
(b) (i) Derive the scalar and magnetic vector potential of a magnetic field(10)
(ii) Derive an expression for the torque of a current carrying loop (6)

13. (a) (i) Solve the Laplace’s equation for the potential field in a homogenous region between two concentric conducting spheres with radius ‘a’ and ‘b’ where b>a, V=0 at r=b and V=Vo at r=a. Find the capacitance between two concentric spheres. (10)
(ii) Derive the Poisson’s and Laplace’s equation. (6)
Or
(b) (i) Derive the equation of the inductance of a toroid(8)
(ii) Derive an expression for the energy and energy density of a magnetic field (8)

14. (a) (i) Derive the expression for displacement current density and conduction current density- (8)
(ii) Justify the inconsistency of Ampere’s circuital law and derive the proof of modified form of ampere’s circuital law (8)
Or
(b) (i) Derive the expression for the equation of instantaneous ,reactive and complex power(8)
(ii) Derive the expression for the power of co-axial cable (8)

15. (a) (i)From the Maxwell’s equation , Find the electromagnetic wave equation in the conducting medium in the E and H fields(10)
(ii) Explain about the depth of penetration (6)
Or
(b) (i) Explain the types of polarization of uniform plane waves(10)
(ii) Derive an expression for Brewster’s angle (6)

Paper – II

Subject Code: Ec2253
Subject Name: Electromagentic Fields Marks:100
Part-A (10*2=20)
1. State coulombs law?
2.What is an absolute potential?
3. What is magnetic dipole moment?
4. Can a magnetic field exist in a good conductor if it is static or time varying? Explain.
5. What is the relation between relative permeability and susceptibility?
6. What are the different types of magnetic materials?
7.State lenz’s law
8. Give the equation of transformer emf ?
9. For a loss dielectric material having µr=1, r=48, =20s/m. calculate the propagation constant at a frequency of 16 GHz ?
10. Mention the properties of uniform plane wave.

Part-B : (16*5=80)
11 a) Derive an expression for the electric field due to a straight and infinite uniformly charged wire of length ‘L’ meters and with a charge density of + c/m at a Point P which lies along the perpendicular bisector of wire.. (16)
OR
b) Derive an expression for potential due to infinite uniformly charged line and also derive potential due to electric dipole. (16)

12. a (i) Derive an expression for force between two current carrying conductors (8)
(ii) An iron ring with a cross sectional area of 3cm square and mean circumference of 15 cm is wound with 250 turns wire carrying a current of 0.3A. The relative permeability of ring is 1500.Calculate the flux established in the ring. (8)
OR
b) Derive the expression for magnetic field intensity and magnetic flux density due to finite and infinite line. (16)

13 . a) (i) Derive an expression for the capacitance of two wire transmission line. (8)
(ii)Derive an expression for capacitance of co-axial cable. (8)
OR
b) Solve the Laplace’s equation to find the Capacitance between two Parallel plates at x=0 and x=d with V=0 and V=V0 respectively.(16)