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Calculating the ratio of the mass of a toner particle to magnitude of its net charge

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?
 

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