What is the electric field at the centre of an equilateral triangle, if three identical charges each of charge q are fixed at the three corners of the triangle?

Explanation

`therefore E_(PC) = (1)/(4pi epsi_(0))(q)/(((2q)/(sqrt3))^(2))= E_(0)`
`therefore E_(PB) = E_(0) and E_(PA)= E_(0)`
Also, `E.=E_(0) cos 60^(@) xx 2 = E_(0)`
`rArr E= E_(0)- E_(0)= 0`