Identical +1.8 micro Colomb charges are fixed to adjacent corners of a square. What charge (magnitude and algebraic sign) should be fixed to one of the empty corners, so that the total electric potential at the remaining empty corner is 0V?
The problem is ambiguous. There are either a total of two charges or four charges. I should solve for the two possibilities.
When I solve for the sum of electric potential (Voltage $= k q/ r$) should one of the $r$ values be the diagonal length of the square?
If the $r$ value is not the diagonal length, should the $r$ value be only the length of the square?
How can the remaining corner have a specific charge that makes it's voltage 0? Does its charge change the voltage and charges at other corners of the square?