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## Homework Statement

A photocopier imaging drum is positively charged to attract negatively charged toner particles. Near the surface of the imaging drum, the E field has a magnitude of 1.90 × 105 N/C

A. What must be the be the magnitude of the negative charge on a toner particle of mass 2.80 × 10 -12 kg if it is to be attracted to the drum with a force that is 10.0 times its weight?

B. How many extra electrons does the toner particle carry?

## Homework Equations

I have already figured out A with F=qe and W=mg

That answer came out to be = 1.44E-15 C

I can't figure out B. How many extra electrons does the toner particle carry?

## The Attempt at a Solution

The answer here is 9.03E+3 but I don't know how that is the right answer, can someone please explain? I feel like it is probably just a formula, but i don't know it