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Answers
Electromagnetic Theory:
Magnetism and electricity were once considered as separate forces. However, in the year 1873, Clerk Maxwell, a Scottish physicist developed a unified theory of electromagnetism. Its study deals with how the electrically charged particles interact among themselves and with the magnetic field. The main electromagnetic interactions are provided in the points mentioned below.
Magnetic poles come in pairs that repel and attract each other, just like electric charges do.
The force of repulsion or attraction between two electric charges is inversely proportional to the square of the distance between the particles.
An electric field in motion produces a magnetic field.
A wire with an electric current produces a magnetic field whose direction depends on the direction of the electric current