**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 P_{2}?
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 = ( E_{x} = 5.46e+7 N/C, E_{y} = -1.64e+8 N/C, |E| = 1.73e+8 N/C, angle = 288 degrees )