Two point dipoles of dipole moment `vecp_1 and vecp_2`. are at a distance x from each other and `vecp_1`||`vecp_2`. The force between the dipoles is :
Options:
(a) `1/(4piepsilon_0)(4p_1p_2)/x^4`
(b) `1/(3piepsilon_0)(4p_1p_2)/x^3`
(c) `1/(6piepsilon_0)(4p_1p_2)/x^4`
(d) `1/(8piepsilon_0)(4p_1p_2)/x^4`