Alarge positively-charged object with charge q = 5.25 μc is brought near a negatively-charged plastic ball suspended from a string of negligible mass. the suspended ball has a charge of q– = –53.3 nc and a mass of 12.5 grams. what is the angle the string makes with the vertical when the positively charged object is 20.5 cm from the suspended ball? the positively-charged object is at the same height as the suspended ball.