7. Explain why magnetism is said to be a relativistic phenomenon. 8. What do you mean by invariance of Maxwell's equations? 9. Show that the pair of equations V-B = 0 and VX E P 10. Show that the pair of electrons V.E = Eo B t and V x B= Ho is invariant under L.T. 7+ o JE t is invariant under L.T.