Practice Problem on Electrical Potential for Point Charges



  Q1=+5 micro-C - o-------------------o Q2=-3 micro-C
                ^ |                   |
            2cm | |                   |
                | |                   |
                v |                   |
  Q3=+6 micro-C - o-------------------o P4           
                  |--------4cm--------|
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 = 1.00e+6 V )