On completion of this subject the student should be able to:
1. Demonstrate familiarity with the physical concepts relating to electric and magnetic fields in free space and in materials;
2. Calculate the strengths of electric and magnetic fields and their potentials in a variety of systems;
3. Apply knowledge of electromagnetic fields to solve problems of design of actual devices.
Brief review of conservative fields; The electric field and electrostatic potential; Gauss's law and divergence; Deductions from Gauss's law; Earnshaw's theorem; Laplace's and Poisson's equations; Equipotentials and lines of force; Line and surface charge; Electric dipoles and quadruples; Dielectrics; Polarisation, displacement, boundary conditions for displacement and electric field; Energy in a field with dielectrics; Magnetic field of a current: the Biot-Savart law, Ampere's law, application to the helical solenoid; Magnetostatic potential, magnetomotive force, vector potential; Electromagnetic induction, Faraday's laws, Lenz's law; Eddy currents and induction heating; Transmission lines; Input impedance of lossless parallel wire and coaxial lines; Mismatching, voltage standing wave ratio; Input impedance of mismatched and lossy lines.
Grant, I. S., Phillips, W. R., Electromagnetism, Wiley, Chichester, USA, 1978.
Lorrain, P., Corson, D. P., Lorrain, F., Electromagnetic fields and waves, W. H. Freeman, San Francisco, USA, 1988.
Continuous assessment 40%
Written examination 60% (1×3 hrs.)
Phone: +675 473 4999 Fax: +675 475 7776
