Introduction - If you have any usage issues, please Google them yourself
Electromagnetic theory is essentially a study of some particular field. We define a field
as a function which specifies a particular quantity everywhere in a region. If the quantity is a scalar (or vector), the field is said to be scalar (or vector) field. Examples of
scalar fields include temperature distribution in a building, sound intensity in a theater and
electric potential in a region. The gravitational force on a body in space, the velocity of
raindrops in the atmosphere and the velocity of fluid particles in a fluid motion are
examples of vector fields.