Practice Problem on Electric Field for Point Charges



                     Q1=-7 micro-C
                           o
                          / \
                         /   \
                        /     \
                       /       \
                      /         \
                     /           \
                    /             \
                   /               \
                  /                 \
              P2 o-------------------o Q3=-8 micro-C
                 |------- 4cm -------|



2 charges are arranged on an equilateral triangle as shown above. What is the electric field at P2? Give the x and y components, the magnitude, and the direction. Specify the electric field 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 = ( Ex = 6.46e+7 N/C, Ey = 3.41e+7 N/C, |E| = 7.30e+7 N/C, angle = 28 degrees )