ELECTROMAGNETIC WAVES

CONTENT

1. The Concept of Electromagnetic Waves
2. The Concept of Electromagnetic Field
3. Fleming’s Left Hand Rule
4. Force between Two Parallel Curent-carrying Conductors
5. Applications of Electromagnetic Field
6. Electromagnetic Induction
7. The Laws of Electromagnetic Induction
8. Eddy Currents
9. Advantages and Disadvantages of Eddy Currents

The Concept of Electromagnetic Waves

Unlike mechanical waves, electromagnetic waves are waves that require no material medium for propagation. Thus, they can propagate through a vacuum or free space.

The human eye can only see light of which the wavelength lies between 3.8 ×10^{– 7}m and 7.2 ×10^{– 7}m. Other examples of electromagnetic radiation differ from visible light  only in wavelength and in the ways of producing them. However, they all have the same velocity of value 3.0 ×10⁸m/s.

EVALUATION

1. What are electromagnetic waves?
2. Differentiate electromagnetic waves from mechanical waves.
3. What is the common speed value of all electromagnetic waves?
4. List the components in the electromagnetic spectrum.