Asmall ball of known mass m, with a small charge +q of known magnitude, is provided. the ball is attached to an insulating string. the additional laboratory equipment available includes only those items listed below, plus stands and clamps as needed.
choose the equipment you would use to make measurements needed to determine the magnitude and direction of the electric field between the two plates:

wooden meterstick, protractor, screen, spring scale, stopwatch, bright light, metal rod, camera (still or video), binoculars.