Practice Problem on Electrical Potential for Point Charges



  Q1=+1 micro-C - o----------------------o Q2=+7 micro-C
                ^ |                      |
                | |                      |
            3cm | |                      |
                | |                      |
                | |                      |
                | |                      |
                v |                      |
             P3 - o----------------------o Q4=+9 micro-C
                  |---------5cm----------|



3 charges are arranged on a rectangle as shown above. What is the electrical potential (voltage) at P3? Specify your answer to three significant places.

ANSWER = ( V = 3.00e+6 V )