EFI at the Centroid!
equal charges are placed on the three vertices of the equilateral triangle, as shown in the figure. Find the Electric Field Intensity at the triangle's centroid.
The answer is 0.
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The answer is 0 because all charges are equally distant from the centroid and all the charges are equal.The net electric field at the centroid is the vector sum of the three electric fields.
We can also conclude that the intensity at the triangle's centroid is 0 by symmetry.