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Charges +2q,+q,+q are placed at the corners of an equilateral triangle.if E is the electric field at the centre of the triangle due to the charge +q, then

magnitude of the resultant electric field at the centre is


The resultant of +q and +q is
R= \sqrt{E^2+E^2-2E^2cos60}=\sqrt{E^2+E^2-E^2}=E
the that resultant acts parallel to electric field due to +2q but opposite in direction
So final resultant is E acting away from the charge +2q
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