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## Homework Statement

The electric potential a distance

*r*from a point charge

*q*is 195 V, and the magnitude of the electric field is 2870 N/C. Find the values of

*q*and

*r*.

## Homework Equations

2780q=F

Fr=W

W/q=195

## The Attempt at a Solution

Using substitution I got r=.00679 meters, which is correct. I can't substitute to find q... I have no idea what to do.