Answer to Question #49179 in Electricity and Magnetism for satya

Question

A charge particle projected into a region that may have an electric field (E) and/or magnetic field (B). If the charged particle goes un-accelerated, then it is not possible that :
(1) E = 0, B = 0
(2) E ≠ 0, B = 0
(3) E = 0, B ≠ 0
(4) E ≠ 0 ,B ≠ 0