Practice Problem on Electrical Force for Point Charges



  Q1=+1 micro-C - o--------o Q2=-7 micro-C
                ^ |        |
                | |        |
            3cm | |        |
                | |        |
                | |        |
                | |        |
                v |        |
  Q3=-3 micro-C - o--------o Q4=+5 micro-C
                  |--2cm---|
4 charges are arranged on a rectangle as shown above. What is the force on charge Q3? Give the x and y components, the magnitude, and the direction. Specify the force to three significant places and the angle to the nearest integer. Use the convention that right is 0 degrees, up is 90 degrees, left is 180 degrees, and down is 270 degrees.

ANSWER = ( Fx = 2.57e+2 N, Fy = -9.08e+1 N, |F| = 2.72e+2 N, angle = 340 degrees )