8. • An electron travels in the +x-direction in a magnetic field and is acted on by a magnetic force in the

−y-direction.

(a) In which of the following directions could the magnetic field be oriented: (1) −x, (2) +y,

(3) +z, or (4) −z? Explain.

(b) If the electron speed is 3.0 × 106 m/s and the magnitude of the force is 5.0 × 10−19 N, what is the field strength?