The dimensional formula of angular velocity is

Answer

D

Explanation

Potential at outermost shell
`=(KQ_(1))/(3r)+(KQ_(2))/(3r)+(KQ_(3))/(3r)=0`
`rArr Q_(1)+Q_(2)+Q_(3)=0` …(i)
and potential at innermost surface
`(KQ_(1))/(r)+(KQ_(2))/(2r)+(KQ_(3))/(3r)=0`
`rArr (K[6Q_(1)+3Q_(2)+2Q_(3)])/(6r)=0` ...(ii)
From eq. (i) & (ii) `Q_(1)=-Q_(2)/4` and also `Q_(2)/Q_(1)=3`