Plz help me 
 A negative charge of-3.0Cand a lositive charge of 3.0 Care separated by 1m, What is the force between the two
 charges?
 A negative charge of -0,5 Cexerts a repelling force of 10.0 N on a second charge that is 0.5m away. What is the sign
 and magnitude of the second charge?
 R21