find the magnitude of the electric field at the point P in the configuration shown in figure for `dgtgta, Take2qa = p.`

Explanation

`(a) Taking `
` P=2qa,E=1/(4piepsilon_0)q/d^2 `
` E_1sin theta=E_2sin theta `
` So, E=E_1cos theta+E_2 cos theta `
` =E_1cos theta+E_2 cos theta `
` 2E_1cos theta `
` =2(1)/(4piepsilon_0).(qa)/(d^2+a^2)^(3/2) `
` 1/(4piepsilon_0).p/d^3 (:. altltd)`