- #1
leonne
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Homework Statement
Find the force on +q . Theres a graph which has +q on 3d in the z axis and -2q on d in the z axis
Homework Equations
F=-1/4pie Eo (q2/(2d)2
The Attempt at a Solution
I don't understand why you need to add mirror image of the charges to find the force.
I know how to solve the problem from there.
The answer is -1/4pieEo(29q2/72d2