Three points charges =q, -2q, +q are arranged on the vertices of an equilaterial triangle as shown in the figure. Find he dipole moment of the system.

Explanation

Arrangement of the charges is equivalent to two dipoles having dipole moment p each as shown above.
Net dipole moment
`P_("net")=p cos 30^(@)+p cos 30^(@)`
`P_("net")=2pcos 30^(@)=p sqrt(3)=qasqrt(3)`