Homework Help: physics

Posted by amber on Thursday, September 3, 2009 at 1:42pm.

Four point charges have the same magnitude of 2.62 10-12 C and are fixed to the corners of a square that is 3.80 cm on a side. Three of the charges are positive and one is negative. Determine the magnitude of the net electric field that exists at the center of the square.

physics - bobpursley, Thursday, September 3, 2009 at 2:56pm
Symettry. Two opposite charges must be +, so they cancel E since opposite directions. tHe other two add, so E=k2q/distance^2

where distance is 0ne half of the diagonal.

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