Final answer:
The net charge of the system is calculated by subtracting the number of protons from the number of electrons.
Step-by-step explanation:
In order to find the net charge of a system, we need to subtract the number of protons from the number of electrons. In Part A, we have 6.08×10^6 electrons and 7.70×10^6 protons, so the net charge would be (6.08×10^6 - 7.70×10^6) = -1.62×10^6. In Part B, we have 218 electrons and 185 protons, so the net charge would be (218 - 185) = 33.