Hi Im just having trouble figuring out this question. If someone can help me out it would be greatly appreciated The imaging drum of a photocopier is positively charged to attract negatively charged particles. Near the surface of the drum, its electric field has a magnitude of 1.40 * 10^5 N/C. A toner particle is to be attracted to the drum with a force that is ten times the weight of the particle. What is the ratio of the mass of a toner particle to the magnitude of its net charge? If the toner particles are made of carbon, how many carbom atoms are there for each excess electron on a toner particle?