Learning Goal:

To apply Problem$-$Solving Strategy $18\mathrm{.}1$ Calculation of potential.

Three point charges with values q$1$q$1=8\mathrm{.}00$ nCnC $,$ q$2$q$2=1\mathrm{.}00$ nCnC $,$ and q$3$q$3=5\mathrm{.}00$ nCnC are placed on three consecutive corners of a square whose side measures ss $=4\mathrm{.}00$ mm $.$ Point A lies at the fourth corner of the square, diagonally across from q$2$q$2.$ Point B lies at the center of the square. What are the values of the electric potential at point A and at point B$?$ How much energy $($supplied as work$)$ is required to move a test charge q$4$q$4=2\mathrm{.}00$ nCnC from point A to point B$?$ Assume the zero of electric potential is chosen to be at infinity.