# What is electromagnetics?

## What is electromagnetics?

—ALBERT EINSTEIN 1.1 INTRODUCTION Electromagnetics (EM) may be regarded as the study of the interactions between electric charges at rest and in motion. It entails the analysis, synthesis, physical interpretation, and application of electric and magnetic fields.

### What are some of the best books on electrostatics?

New York: John Wiley & Sons, 1973; and C. E. Jowett, Electrostatics in the Electronics Environment. New York: John Wiley & Sons, 1976. 2 An interesting story on the magic of electrostatics is found in B. Bolton, Electromagnetism and Its Applications.

#### What are the three characteristics of electromagnetic energy?

All forms of EM energy share three fundamental characteristics: they all travel at high velocity; in traveling, they assume the properties of waves; and they radiate outward from a source, without benefit of any discernible physical vehicles. The problem of radia- tion will be addressed in Chapter 13.

What is an electromag Netic flow diagram used for?

This electromag- netic flow diagram helps with the visualization of the basic relationships between field quantities. It also shows that it is usually possible to find alternative formulations, for a given problem, in a relatively simple manner.

What is paramagnetism?

Paramagnetism occurs in materials where the magnetic fields pro- Magnetic Materials Linear Nonlinear Diamagnetics Paramagnetics Ferromagnetics Xm<0, M r s 1.0 Xm > 0, fir a Xm » 0, nr a> Figure 8.13 Classification of magnetic materials. 2 An excellent treatment of superconductors is found in M. A. Plonus, Applied Electromagnetics.

## Is electromagnetic theory difficult?

As usual, I welcome your comments, suggestions, and corrections. Matthew N. O. Sadiku fA NOTE TO THE STUDENT Electromagnetic theory is generally regarded by most students as one of the most difficult courses in physics or the electrical engineering curriculum. But this misconception may be proved wrong if you take some precautions.

### What is the value of XM in diamagnetism?

For most diamagnetic materials (e.g., bismuth, lead, copper, silicon, diamond, sodium chloride), xm is of the order of – 1 (T5. In certain types of materials called super- conductors at temperatures near absolute zero, “perfect diamagnetism” occurs: xm = ~ 1 or jjir = 0 and B = 0.

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