Question

Why is field theory necessary?

Answer 1

Field theory:

1. The behavior of particles, when they are positioned at different sites in the field, is explained using field theory.
2. Magnetic and electric field theory can be used to compute the magnetic/electric force when a unit positive charge is placed at any point in the system.
3. When specific forces are applied to particles, field theory aids in understanding the magnitudes of these forces at various places, as well as when the same magnitude operates on the particles at many locations at the same time.
4. Field theory can be used to investigate electromagnetic waves.