Practice Problem on Electrical Force for Point Charges



                     Q1=-4 micro-C
                           o
                          / \
                         /   \
                        /     \
                       /       \
                      /         \
                     /           \
                    /             \
                   /               \
                  /                 \
   Q2=+9 micro-C o-------------------o Q3=+5 micro-C
                 |------- 4cm -------|
3 charges are arranged on an equilateral triangle 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 = 1.97e+2 N, Fy = 9.73e+1 N, |F| = 2.19e+2 N, angle = 26 degrees )