12th grade.physics
posted by nikita .
three equal and similar charges each of 'q' units are placed at the corners of the square of side 'a' .find the electric field strength at the fourth corner?

E=kq/r^2 and in the direction of r.
Add these as vectors. If you are careful, you can use symmetry to simplify it.
Here is a similar question on the symmetry issue. http://www.jiskha.com/display.cgi?id=1270726327 
3000mm=____m?

Can you please Explain and Show the answer ?
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