An accelerating voltage of 2.52 x 10^3 V is applied to an electron gun, producing a beam of electrons originally traveling horizontally north in vacuum toward the center of a viewing screen 35.7 cm away.
(a) What is the magnitude of the deflection on the screen caused by the Earth's gravitational field (in m)?
m
(b) What is the magnitude of the deflection on the screen caused by the vertical component of the Earth's magnetic field, taken as 20.0 µT down (in mm)?
(c) Explain why it is a good approximation to assume it has this projectile motion?