Question

2.
The electromagnetic field due to a point charge must be described by
Lienard Weichert potentials when :
(a) The point charge is highly accelerated
(b) The electric and magnetic fields are not perpendicular
(c) The point charge is moving with velocity close to that of light
(d) The calculation is done for the radiation zone, i.e., far away from the
charge
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Answer 1

Answer:

The Liénard–Wiechert potentials describe the classical electromagnetic effect of a moving electric point charge in terms of a vector potential and a scalar potential in the Lorenz gauge. Stemming directly from Maxwell's equations, these describe the complete, relativistically correct, time-varying electromagnetic field for a point charge in arbitrary motion, but are not corrected for quantum-mechanical effects. Electromagnetic radiation in the form of waves can be obtained from these potentials. These expressions were developed in part by Alfred-Marie Liénard in 1898[1] and independently by Emil Wiechert in 1900.