The electric field of an electromagnetic (EM) wave does not depend on its velocity. The velocity of an EM wave, which is the speed of light in a vacuum (approximately 3 x 10^8 meters per second), is a fundamental constant of nature and is independent of the properties of the wave itself.
The electric field of an EM wave is described by Maxwell's equations, which are a set of fundamental equations that govern the behavior of electric and magnetic fields. In particular, the electric field is related to the magnetic field through Faraday's law of electromagnetic induction and Ampere's law with Maxwell's addition.
The electric field and magnetic field of an EM wave are perpendicular to each other and oscillate in directions perpendicular to the direction of wave propagation. The wave propagates through space with a constant velocity, and both the electric and magnetic fields oscillate in a synchronized manner.
The amplitude of the electric field, which represents the maximum strength of the field, is determined by the intensity or energy of the EM wave. The intensity of the wave is related to the square of the amplitude of the electric field. However, the velocity of the wave itself does not affect the strength or amplitude of the electric field.
In summary, the electric field of an EM wave does not depend on its velocity. The velocity of an EM wave is a constant, while the amplitude of the electric field determines the intensity of the wave.