A short electric dipole of dipole moment `vecp` is placed at a distance r from the centre of a solid metallic sphere of radius a (<
Options:
(a) `zero`
(b) `1/(4piepsilon_0)(2p)/r^3` along CO
(c) `1/(4piepsilon_0)(2p)/r^3` along OC
(d) `1/(4piepsilon_0)p/r^3` along CO