. Common static electricity involves charges ranging from nanocoulombs to microcoulombs. {a} How many electrons are needed to form a charge of 2.00I1C (b) How many electrons must be removed from a neutral object to leave a net charge of 0.500pC? . (a) How strong is the attractive force between a glass rod with a 0.700103 charge and a silk cloth with a 0.6001.LC charge, which are 12.0 cm apart, using the approximation that they act like point charges? (b) Discuss how the answer to this problem might be affected if the charges are distributed over some area and do not act like point charges. . Two point charges are brought closer together, increasing the force between them by a factor of 25. By what factor was their separation decreased? . If two equal charges each of 1 C each are separated in air by a distance of 1 km, what is the magnitude of the force acting between them? You will see that even at a distance as large as 1 km, the repulsive force is substantial because 1 G is a very signicant amount of charge. . A test charge of +2 uC is placed halfway between a charge of +6uC and another of +4pC separated by 10 cm. {a} What is the magnitude of the force on the test charge? (b) What is the direction of this force {away from or toward the +6111: charge}? . (a) Two point charges totaling 8.00pC exert a repulsive force of 0.150 N on one another when separated by 0.500 m. What is the charge on each? (b) What is the charge on each if the force is attractive