Question

ELECTRODYNAMICS;

State if the following quantities are conserved, invariant, Lorentz-variant or positive; Do not just mark the answers; you have to briefly justify why. Make a 4 x 5 marking the answers An A" SPlF)dT -Pup SdT Some clarification on the terms: AuA SdT a) A is the vector potential at a certain point. b) It is the definition of a charge in a volume V. c) The 4 momentum vector of a particle. d) Energy flowing out through a volume; S is the Poynting vector.

Answer 1

Au AM invariant cartain poimt E is Lorentz sealer. an at a Total ehange onser ved - Pap 2 Khere Test mart areate spornoalways posih ve J S rgy flowing out thouh a Voume 11 i changes it Lorente Vaviant We do a Value Lorente hramsfor mahion