three particles are placed in a line. the left particle has a charge of -67uc the middle one has a charge of 45uc and the right one has a charge of...

three particles are placed in a line. the left particle has a charge of -67uc the middle one has a charge of 45uc and the right one has a charge of -83uc. the middle particle is 72 cm from each of the others as shown in figure 20 16. a.find the net force on the middle particle. b.find the net force on the right particle