a.) What must the charge (sign and magnitude) of a 1.45 g particle be for it to remain balanced against gravity when placed in a downward-directed electric field of magnitude 650 N/C? Draw a diagram showing the particle, electric field, and forces.
b.) What is the magnitude of the electric field in which the electric force it exerts on a proton is equal in magnitude to the proton's weight?
Mass of proton = 1.67262*10^-27 kg
Charge of proton = +1.60*10^-19 C