4. A particle of charge q = = moves in velocity v = (2 + m)i - (5 + m)j - 4k in magnetic field B = (7 + m)j + 2k and electric field E = 51 - j + (2 + m)k . a. Compute the Lorentz force experienced by the particle (13 marks) b. The magnitude of this force (4 marks)