At one instant an electron(charge = -1.6 x 10^-19 C)is moving in the xy plane , the components of its velocity beingvx = 3.0 x 10^5 m/s and vy=4.0x10^5m/s. A magnetic field of 0.8T is in the positivez direction. At that instant the magnitude of the magnetic force onthe electron is ....
(a) 0
(b) 2.9 x 10^-14 N
(c) 3.8 x 10^-14 N
(d) 4.8 x 10^-14 N
(e) 6.4x10^-14 N
