There are three charges of 5, 5 and -5 micro coulomb at the corners of triangle 10 centimeter in length of each side. At the center a charge of 10-micro coulomb is located.
A: Find what is the scalar field V, at the center of the square due to the other three corner charges?
B: Find what is the potential energy of the 10-micro coulomb due to the other three?
C: Find what is the energy to bring the fourth charge to its location in the triangle from infinity?