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this is problem 30 from chapter 21 a point charge is placed at each corner of the square with side length a the charges will all have the same magnitude - the charges are positive and two are negative the top two are positive top two are negative Iamp;#39;ve labeled them one two three and four just to keep them straight the question is what is the direction of the net electric field of the centre of the square due to the four charges and what is the magnitude in terms of Q and a so letamp;#39;s figure out what we know about electric fields specifically electric fields that are asking about the electric field at a point a distance away from the charge well that equation is equal to K of the charge that is making the electric field over the distance from the charge to where weamp;#39;re measuring it okay so letamp;#39;s think about this we already know Q itamp;#39;s said in the problem that each of these charges has the same magnitude so weamp;#39;re just going to call that Q what