University of Delhi 2010-3rd Year B.Sc PMCS (Physics, Mathematics, Computer Science) Prog PHYSICS ELECTROMAGNETIC THEORY_2 UNIVERSITY - Question Paper
This question paper contains 3 printed pages.
5176A Your Roii Mo.-----------------.....
B.Sc. Prog. / III
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Paper PH-301- PHYSICS (ELECTROMAGNETIC THEORY)
Time 3 hours Maximum Marks '75
(Write your Roll No on the top immediately on receipt of this question paper)
Attempt any five questions.
411 questions carry equal marks.
1. a) Define electric field intensity, electric flux density and electrostatic potential 05
b) State and explain Gauss law in electrostatics. Using Gauss law obtain an expression for electric flux density due to a uniformly charged cylinder. 10
2 a) State and explain Faraday's law of em induction of a
coil. 05
b) Explain self inductance and mutual inductcance. 05
c) Derive an expression for energy stored in an inductor.
05
b) Describe Wein bridge method to determine the capacitance of an unknowncapacitor. 07
4 a) State and Explain Maxwells equations in integral and
differential forms in free space, OS
b) State the boundary conditions for fit and ffrields across the interface of two dielectrics tinder static conditions. 07
5 a) Discuss the propagation of plane electromagnetic waves
in a perfect dielectric. Establish that electromagnetic waves are transverse in nature and hence how that
E. H and K form a right handed system. JO
b) An electromagnetic wave travels in free space with the electric field component E = EQ sin (wt - pz) ay , find
D, B and H. 05
6 a) Briefly explain the concept of total internal reflection
using Snells law. Give two examples. 08
b) Calculate the coeffiicents of reflection at normal incidence for a plane wave incident on silver from vaccuum.
(w= 105Hz, ct = 6 x 101 mho). 07
b) Distinguish between left - handed and right handed circularly polarised light 05
8. Write short notes on any two of the following: '
0 Poynting theoreom ii) Mesh and Nodal analysis fit) Properties and application of LCR series resonator iv) Plasma T/% x2
200
a) What is an optical fiber ? Derive the relation between
the numerical aperture and the acceptance angle in optical fibre. 10
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