Practice Problem on Electrical Potential for Point Charges



  Q1=-7 micro-C - o--------o Q2=+3 micro-C
                ^ |        |
            2cm | |        |
                | |        |
                v |        |
  Q3=+6 micro-C - o--------o P4           
                  |--2cm---|



3 charges are arranged on a rectangle as shown above. What is the electrical potential (voltage) at P4? Specify your answer to three significant places.

ANSWER = ( V = 1.82e+6 V )