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calcuseless
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Homework Statement
The picture shows a small 2g mass suspended from a massless thread. When a horizontal electric field of 2000 N/C pointing left to right is applied, the mass moves to the position shown and then comes to a stop. Calculate the magnitude of the charge on the mass.
http://imgur.com/3uSDc
Homework Equations
Coulomb's Law: F= (k*q1*q2)/r2
F=qE
The Attempt at a Solution
I know the charge is negative by the picture, but I can't use these equations without more information. Am I missing an equation I should know or just a concept that let's me ignore something?
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