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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?

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