An electron travels at a speed of 2.0 x 104 m/s through a uniform magnetic field whose

Question:

An electron travels at a speed of 2.0 x 104 m/s through a uniform magnetic field whose magnitude is 1.2 x 10-3 T. What is the magnitude of the magnetic force on the electron if its velocity and the magnetic field
(a) Are perpendicular,
(b) Make an angle of 45o,
(c) Are parallel, and
(d) Are exactly opposite?