Final answer:
The speed of propagation of a change in the Electromagnetic Field can be derived from Maxwell's Equations, which describe the behavior of electromagnetic waves.
Step-by-step explanation:
The speed of propagation of a change in the Electromagnetic Field can be derived from Maxwell's Equations, which are a set of four equations that describe the behavior of electromagnetic waves. One of the equations, known as Ampère's Law with Maxwell's correction, relates the changing magnetic field to the electric field and vice versa.
By combining this equation with other Maxwell's equations, we can obtain an equation that describes the propagation of electromagnetic waves through space at the speed of light, which is approximately 3.00 × 10^8 meters per second.