Question

Find the electric field at the location of qa in the figure below, given that qb...

Find the electric field at the location of qa in the figure below, given that qb = qc = qd = +2.60 nC, q = −1.00 nC,

and the square is 14.0 cm on a side. (The +x axis is directed to the right.)

magnitude    
What symmetries can you take advantage of? Which charges have the same magnitude and are at the same distance from qa? N/C
direction     ° counterclockwise from the +x-axis

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