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## Homework Statement

A positively charged particle (9.35pC) is suspended in equilibrium in an electric field between two horizontal parallel plates with opposite charges. Each one of the square plates has a charge of 5.5x10^-5C; and are separated by 6.25mm and their sides are 11cm long

what is the mass of the particle?

## Homework Equations

E=kq/r^2

n=q/qp

idk...

## The Attempt at a Solution

first i divided the charge of the particle by the elemental charge

9.35x10^-12/1.602x^-19

i got 58364544

then i multiplied this number by a protons mass

58364544*(1.673x^-27)

i got 9.764x10^-20

the book says the answer is 4.9x10^-4

soo confused!