JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Electromagnetic Fields

Course Objectives:

• To understand the basic skills required to understand, develop, and design various engineering applications involving electromagnetic fields.
• To understand the foundations of electromagnetism and its Practice in modern communications.
• To understand Behavior of Conductors and Insulators in electric field

Course Outcomes

After the completion of this course, student will be able to:

• Apply vector calculus to static electric-magnetic fields in different engineering situations.
• Analyze Maxwell’s equation in different forms (differential and integral) and apply them to diverse engineering problems.
• Examine the phenomena of wave propagation in different media and its interfaces and in applications of microwave engineering.
• Analyze the nature of electromagnetic wave propagation in guided medium which are used in microwave applications.

UNIT - I

Electrostatics Electrostatic Fields – Coulomb’s Law – Electric Field Intensity (EFI) – EFI due to a line and a surface charge – Work done in moving a point charge in an electrostatic field – Electric Potential – Properties of potential function – Potential gradient – Gauss’s law – Application of Gauss’s Law – Maxwell’s first law, div( D )=v – Laplace’s and Poisson’s equations – Solution of Laplace’s equation in one variable.

UNIT - II

Electric Fields - I Introduction, Analytical calculation of space-charge-free fields, simple geometries, transmission conductors to ground, fields in multi-dielectric media, experimental analogs for space - space-charge- free fields, electrolytic tank, semi conducting paper analog, resistive-mesh analog. Numerical computation of space-charge – free fields, successive imaging technique, the dipole method, charge- simulation technique, finite-difference technique, combined charge-simulation and finite-difference technique, finite-element technique, combined charge-simulation and finite-element technique, boundary-element method, integral-equations technique, monte-cario technique.

UNIT - III

Electric Fields - II Analytical Calculations Of Fields With Space Charges, Numerical Computation Of Fields With Space Charges, Finite Element Technique, Finite Element Technique Combined With The Method Of Characteristics, Charge-Simulation Technique Combined With The Method Of Residues, Electric Stress Control And Optimization, Electric Stress Control, Electric Stress Optimization.

UNIT - IV

Conductors, Dielectrics, Dipole and Capacitance Behavior of conductors in an electric field – Conductors and Insulators – Electric field inside a dielectric material – polarization – Dielectric – Conductor and Dielectric – Dielectric boundary conditions – Energy stored and energy density in a static electric field – Current density – conduction and Convection current densities – Ohm’s law in point form – Equation of Electric dipole – Dipole moment – potential and EFI due to an electric dipole – Torque on an Electric dipole in an electric field – Capacitance – Capacitance of parallel plate and spherical capacitors.

UNIT - V

Magneto Statics Time Varying Fields Biot-Savart’s law – Magnetic field intensity (MFI), magnetic flux density and MFI, Ampere’s circuital law and its applications Point form of Ampere’s circuital law. Scalar Magnetic potential and its limitations – vector magnetic potential and its properties, vector Poisson’s equations. Energy stored and density in a magnetic field. Magnetic force - Moving charges in a Magnetic field – Lorentz force equation –– a differential current loop as a magnetic dipole, Time varying fields – Faraday’s laws of electromagnetic induction – Its integral and point forms, Statically and Dynamically induced EMFs - Modification of Maxwell’s equations for time varying fields – Displacement current.

TEXT BOOKS:

• 1. “Engineering Electromagnetics” by William H. Hayt & John. A. Buck McGraw Hill Companies, 7th Editon.2005. th
• 2. “Electromagnetics” by J. D Kraus McGraw Hill Inc. 4 edition 1992.

REFERENCES:

• 1. “Field Theory”, by Gangadhar, Khanna Publishers.
• 2. “Elements of Electromagnetic field theory “, by Sadiku, Oxford Publ.
• 3. “Electromagnetics” by J P Tewari.
• 4. “Introduction to E-Magnetics” by CR Paul and S.A. Nasar, McGraw Hill Publications
• 5. “Introduction to Electro Dynamics” by D J Griffiths, Prentice Hall of India Pvt. Ltd, 2nd editon
• 6. “Electromagnetics” by Plonsy and Collin
• 7. “Engineering Electro magnetics” by Nathan Ida, Springer(India) Pvt. Ltd. 2nd Edition. M. Tech – I Year – II Sem. (PS H.V. Engg. / H.V. Engg.) SIMULATION LAB
• 1. Analysis and Design of high DC generators
• 2. Analysis and Design of high AC generators
• 3. Analysis and Design of high Impulse voltage generators
• 4. Generation and measurement of HVDC
• 5. Generation and measurement of HVAC
• 6. Generation and measurement of standard impulse voltages
• 7. Generation and measurement of non-standard impulse voltages
• 8. AC breakdown studies on solid insulation
• 9. AC breakdown studies on liquid insulation
• 10. Simulation of field for different electrode arrangements The above experiments may be performed using suitable simulation software.