1. The force of attraction or repulsion that acts between electric charges is inversely proportional to the square of the distance between them.
2. Two different magnetic poles ( North pole and South pole ) always attract each other and two similar magnetic poles ( North pole and North pole or South pole and South pole ) always repel each other, much as electric charges do.
3. The current flowing in a wire produces a magnetic field whose direction depends on the direction of the current flowing.
4. Just as a moving electric field produces a magnetic field, so a moving magnetic field also produces an electric field.
This electromagnetic theory can be better understood by Maxwell's equations. If we talk about Maxwell's four important equations, they are as follows :
Where, ρ = net charge inside the surface, ε0 = represents permittivity of vacuum, B = the magnetic field, E = electric field, and J = the current density
What is Electromagnetic Spectrum?
All these electromagnetic radiations (from radio waves to gamma rays) are plotted according to the intensity of light at different frequency range or distribution of wavelength and frequency. This range in the distribution of wavelength and frequency of all types of electromagnetic radiation is called the electromagnetic spectrum.