A group of particles travels inside the magnetic field of unknown magnitude and direction. It is observed that a proton moving at a velocity of 1.50 Km / s along the +x- direction receives a force of 2.25 × 10-16 N in the +y- direction while an electron moving at a velocity of 4.75 Km / s along the -z- direction is at a force of 8.50 × 10-16N.
(a) What is the magnitude and direction of the magnetic field?
(b) What is the measure and direction of the magnetic force exerted on an electron moving along the -y- direction at a speed of 3.2 Km / s?
(Given e = 1.60 × 10-19 C )