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Three point charges and a test charge are used to create a square with a length...

Three point charges and a test charge are used to create a square with a length of 2 meters on each side. q1(bottom left) has a charge of 1 nC. q2(top left) has a charge of -2 nC. q3(top right) has a charge of 3 nC. q4(bottom right) is the test charge. Calculate E at the test charge.

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