Physics electric field and electric forces homework Qquestion...Please help!!?

Sara E

New member
I am very confused on this homework question. I do not even know to where to begin. It is the only one I could not answer. Please help me solve it!!

A ball of charge +2q is placed on the x-axis at x = -2a. A second ball of charge -q is placed nearby so that the net electric potential at the origin because of the two balls is -8.00 kq/a. At what distance from the origin is the second ball?

Thanks!
 
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