1. An iron atom has 26 protons, 30 neutrons and 26 electrons. a. What is the total charge of its nucleus? b. What is the total charge of its electrons? c. What is the magnitude of the electric force of attraction between an iron nucleus and its innermost electron id the distance between them is 1.5 x 1047 2. Three point charges are q, = +6.8 mC, q, = +55 uC and q, =-78 JC are placed in a line respectively. The charge at the center (q;) is 45 cm away from the charges at the both ends. a. What is the magnitude of electrostatic force on q, exerted by q? b. What is the magnitude of electrostatic force on q, exerted by q,? c. What is the net electrostatic force on q, due to the other two charges