A)a tiny ball suspended at the end of a string has a charge q and is situated in a horizontal uniform electric field of magnitude 700 n ca-1 which points in the positive x-direction (horizontally). when the ball is in equilibrium, the string makes an angle of 20 o to the y-direction (vertically), such that it is displaced away from the vertical in the negative x-direction. the tension in the string has a magnitude of 6.3 x 10^-3 n. calculate the charge on the ball b)two electrons each with a momeentum of magnitude about 10a-23 kg m sa-1 are traveling along the x-axis, approximately 1 nm apart. they pass a measurement device which determines their momentum. to what precision can the momentum be determined without losing the ability to clearly recognize that two distinct particles have passed? (observations of two distinct particles requires that the wave functions representing the two electrons do not overlap appreciably)