Two charges `+- 10 muC` are placed `5xx10^(-3) m` apart. Determine the electric field at a point `Q, 0*15m` away from O, on a line passing through O and normal to the axis of the dipole.

Explanation

In the given problem, `r gt gt a`

`:. E = (1)/(4pi epsilon_(0)) (p)/(r^(3)) = (1)/(4pi epsilon_(0))(q(a))/(r^(3))`
or `E = 9 xx 10^(9)(10 xx 10^(-6) xx 5 xx 10^(-3))/(0.15 xx 0.15 xx 0.15) NC^(-1)`
`= 1.33 xx 10^(5) NC^(-1)`.