KTU B.Tech S6 Lecture Notes ELECTROMAGNETICS

KTU B.Tech S6 Lecture Notes ELECTROMAGNETICS

MODULE I

• STATIC ELECTRIC FIELDS: Introduction to Co-ordinate System – Rectangular – Cylindrical and Spherical Co- ordinate System – Gradient of a Scalar field, Divergence of a Vector field and Curl of a Vector field- Their Physical interpretation. Divergence Theorem, Stokes’ Theorem. Numerical problems

MODULE II

• Coulomb’s Law, Electric field intensity. Field due to a line charge, Sheet Charge and Continuous Volume Charge distribution.

• Electric Flux and Flux Density; Gauss’s law and its application. Electric Potential-The Potential Gradient. The Electric dipole. The Equipotential surfaces. Capacitance – capacitance of co-axial cable, two wire line. Poisson’s and Laplace’s equations

MODULE III

STATIC MAGNETIC FIELD: Biot-Savart Law, Amperes Force Law. Magnetic Field intensity due to a finite and infinite wire carrying a current–Magnetic field intensity on the axis of a circular and rectangular loop carrying a current –Magnetic vector potential, Magnetic flux Density and Ampere’s circuital law and simple applications.

MODULE IV

ELECTRIC AND MAGNETIC FIELDS IN MATERIALS-–Electric Polarization-Nature of dielectric materials-Electrostatic energy and energy density–Boundary conditions for electric fields and magnetic fields–Conduction current and displacement current densities– continuity equation for current. Maxwell’s Equation in Differential and integral form from Modified form of Ampere’s circuital law, Faraday’s Law and Gauss Law

MODULE V

TIME VARYING ELECTRIC AND MAGNETIC FIELDS:. Poynting Vector and Poynting Theorem – Power flow in a co-axial cable –Complex Average Poynting Vector.
ELECTROMAGNETIC WAVES: Wave Equation from Maxwell’s Equation – Uniform Plane Waves –Wave equation in Phasor form

MODULE VI

Plane waves propagation in loss less and lossy dielectric medium and conducting medium. Plane wave in good conductor, surface resistance, Skin depth, Intrinsic Impedance and Propagation Constant in all medium. Phase and group velocity.
Transmission lines: waves in transmission line –solution for loss less lines –characteristic impedance – VSWR – impedance matching. Introduction to Electromagnetic interference and compatibility.