A system has two charges `q_(A)=2.5xx10^(-7) C`, and `q_(B)=-2.5xx10^(-7)C` located at points `A(0, 0, -15 cm)` and `B (0, 0, +15 cm)`. What are the total charge and electric dipole moment of the system?

Explanation

Given `A(0, 0, -15 cm)` and `B(0, 0, 15 cm)`
`q_(A)=2.5xx10^(-7) C`
`q_(B)=-2.5xx10^(-7) C`
`AB=2a=` length of the dipole
`=30 cm =30xx10^(-2) m`
The total charge q on the dipole is
`q=q_(A)+q_(B)=2.5xx10^(-7) C-2.5xx10^(-7) C=0`
The electric dipolemoment
P = Any charge `(q_(A))xx` length of dipole `(2a)`
`=2.5xx10^(-7)xx10xx10^(-2)`
`:. P=7.5xx10^(-8) C-m`
The direction of P is from negative charge to positive charge that is along B to A.