Asked by angy
Four identical positive charges q are placed at the four vertices of a square of side a. Determine the electric field:
A) at the center of the square
B) at te midpoint of one of its sides
A) at the center of the square
B) at te midpoint of one of its sides
Answers
Answered by
Chanz
A is obviously zero.
For b the two points on either side of the midpoint cancel. Then you are going to need to do a little geometry and trig to find the component pushing it down (away from the center). The magnitude is just kq/r^2, and the angle will be tan-1 ((a/2)/a) or tan-1(1/2)
For b the two points on either side of the midpoint cancel. Then you are going to need to do a little geometry and trig to find the component pushing it down (away from the center). The magnitude is just kq/r^2, and the angle will be tan-1 ((a/2)/a) or tan-1(1/2)
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