UNIVERSITY OF MADRAS
B.Sc. DEGREE COURSE IN ELECTRONICS SCIENCE
SEMESTER SYSTEM WITH CREDITS
(Effective from the Academic Year 2003-2004)

Semester II - Main Paper II - Electromagnetism and AC Circuits

Duration: 3 hrs
Maximum Marks: 100
Credits: 4

Unit-1

Electromagnetic Induction : Expression for induced EMF Self induction of a solenoid - Mutual inductance of a solenoid inductor - Coefficient of Self inductance of a solenoid inductor - Coefficient of coupling - Determination of self and mutual inductance - Measurement of intense magnetic field using search coil - Induction coil and its uses - Fluxmeter - Eddy currents.

Unit-2

Alternating Current : EMF induced in a coil rotating in a uniform magnetic field - Mean, RMS and peak values of alternating currents and EMF - Power factor in the case of an AC circuit containing i) resistance ii) Inductance iii) Capacitance iv) Inductance and Resistance - Wattless current - AC circuit having capacitance and resistance - AC circuit having LCR - Resistance and impedance - Series and parallel resonant circuits.

Unit-3

AC Circuits: Construction and working of transformers - Losses - Skin effect - Tesla coil - Growth and decay of current in a circuit having . L and R - Time constant - Growth and decay of charge in a circuit having C and R - High resistance by leakage - Growth and decay of charge in a circuit containing LCR - Condition for discharge to be oscillatory - Frequency of oscillation.

Unit- 4

Electromagnetic Machines : Production and distribution of three phase AC - Star and Delta connections - Advantages of AC over DC - Dynamo - Armature winding - Series, shunt and compound wound dynamos and their characteristics - DC motor - Principle of induction motor - Microphones - Moving coil loudspeaker.

Unit- 5

Maxwell's Equation: Full electromagnetic theory of electromagnetic waves - Maxwell's equations - Derivations in integral and differential forms.

Books for study and reference

1. Electricity and magnetism - Sehgal and Chopra
2. Electricity and magnetism - M. Narayanamoorthi and Others
3. Electricity and magnetism - D.N. Vasudeva
4. Electricity and magnetism - Brijlal and Subramanyam
5. Fundamentals of Physics, 6^th Edition, by D.Haliiday, R.Resnick and J.Walker, Wiley, NY, 2001
6. Physics, 4^th Edition, Vols 1. 2 & 2 Extended by D.Halliday, R.Resnick and KS,Krane, Wiley, NY, 1994
7. CRC Handbook of Physics & Chemistry, 80^th Ed., CRS Press, NY, 1999
8. The Feynman Lectures on Physics, Vols. 1, 2, and 3, by R. P. Feynman, R B Leighton and M Sands, Narosa, New Delhi, 1998
9. Basic Electronics, 6^th Edition by B. Grob, McGraw- Hill, NY, 1989