Consider three charges `q, - q,` (in `Sl` units) at the vetrices of an equilateral triangle with side length b. The magnitude of electric field at the centroid of the triangle is :

Options

A. `(3q)/(2pi epsilon_(0)b^(2))`
B. `(3q)/(4pi epsilon_(90)b^(2))`
C. `(q)/(2pi epsilon_(0)b^(2))`
D. 0

Answer

A

Explanation

`E=(Kq)/(((b)/(sqrt(3)))^(2))=(3Kq)/(b^(2))`
`E_("net") = 2E = (6Kq)/(b^(2))=(3q)/(2 pi epsilon_(0)b^(2))`