Practice Problem on Electric Field for Point Charges



  Q1=+4 micro-C - o-------------------o P2           
                ^ |                   |
            2cm | |                   |
                | |                   |
                v |                   |
  Q3=+8 micro-C - o-------------------o Q4=-8 micro-C
                  |--------4cm--------|



3 charges are arranged on a rectangle 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 = 5.46e+7 N/C, Ey = -1.64e+8 N/C, |E| = 1.73e+8 N/C, angle = 288 degrees )