Solution
For this question consider side of square is "a" Charges are "q" Figure can be shown as
Electric field on fourth corner is given as
E1=a2kq
E2=a2kq
Resultant of both above field is
E′=a22kq
E3=2a2kq
And finally the resultant electric field will be in direction of E3 on fourth corner is given by
E=a22kq+2a2kq
E=a2kq(2+21)
Direction is resultant is 45° from x and y so vector is direction of resultant electric is given by
E=a2kq(2+21)21(i+j)
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