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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.