In 1831 British physicist Michael Faraday was analysing all the cases of electromagnetic induction phenomena – phenomena of current induction in a conductor along…
Category: Electromagnetic Fields and Waves
Electromagnetic Fields and Waves: Preface
Aim of the study element
To explain the basic concepts of electrostatics, magnetism, electromagnet waves and fields, and to use this knowledge to solve complex electrical engineering problems, electrical devices and materials analysis.
Learning outcome
Having successfully completed this element you will be able:
- Understand and use the concepts of electrostatics.
- Understand and use the concepts of magnetism.
- Analyse electrical and magnetic
- Use main electro- and magnetostatic rules and theorems applied to real situations.
- Apply Maxwell equations to circuits.
- Use mathematical tools for circuits in an electromagnetic environment.
Covered topics
- Electric field – Columb law.
- Gauss theorem.
- Work in electrostatic fields.
- Conductors in electrostatic fields.
- Electric fields in insulators.
- Magnetic fields in a vacuum.
- Magnet induction.
- Electromotive force.
- Magnetic fields in compounds.
- Maxwell theory.
Self-induction – Inductivity
Electromagnetic induction occurs in different ways. For example, when current changes in the circuit, there is different kinds of EMF that occurs in the…
Magnetic field energy
A magnetic field is characterised by the energy parameter. If we turn the switch S to position 2 (Figure 33), the current in the…
Magnetic field in the matter
Let’s consider magnets. Magnets are substances that create the magnetic field around them, without currents through the magnets. However, there are micro-currents that operate…
Matter magnetisation
Let’s consider the solenoid that creates a magnetic field when DC current goes through the coil. The field in the solenoid is uniform, and…
Magnetic types
Depending on the value of magnetic permittivity, magnetic substances are divided by the diamagnetics, paramagnetics and ferromagnetics. The first two classes are weak magnetics.…
Maxwell’s magnetic theory
Still a question that has to be answered is why conductivity electrons are moving in the magnetic field in the conducting circuit. (Figure 37).…
Shift current and Maxwell equations
Variable magnetic fields create a vortex electric field in the conductor, which leads to the electric current appearance in the conductor. Let’s consider two…