Calculate the period of oscillation for a particle of positive charge +q displaced from the midpoint and along the line joining the charges in problem 22. section 27-5 charge is quantized 24. find the total charge in coulombs of 75.0 kg of electrons. 25. in a crystal of salt, an atom of sodium transfers one of its electrons to a neighboring atom of chlorine, forming an ionic bond. the resulting positive sodium ion and negative chlorine ion attract each other by the electrostatic force. calculate the force of attraction if the ions are 282 pm apart. 26. the electrostatic force between two identical ions that are separated by a distance of 5.0 x 10-10 m is 3.7 x 10-'n. s (a) find the charge on each ion. (b) how many electrons are 35 missing from each ion? 27. a neutron is thought to be composed of one "up" quark of charge +je and two "down" quarks each having charge -e. if the down quarks are 2.6 x 10 1s m apart inside the neutron, what is the repulsive electrical force between them? 28. (a) how many electrons would have to be removed from a penny to leave it with a charge of +1.15 x 10 c? 36. correspond? see sample problem 2 (b) to what fraction of the electrons in the penny does this 29. an electron is in a vacuum near the surface of the earth. where should a second electron be placed so that the net .pdf