Practice Problem on Electrical Force for Point Charges



  Q1=-9 micro-C - o-------------------o Q2=+4 micro-C
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            5cm | |                   |
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                v |                   |
  Q3=+1 micro-C - o-------------------o Q4=-8 micro-C
                  |--------4cm--------|



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 = 3.95e+1 N, Fy = 2.55e+1 N, |F| = 4.70e+1 N, angle = 33 degrees )