A conducting sphere of radius `2R` carrying charge `Q` is joined to an uncharged conducting sphere of radius `R`. Find the charge flow through cinnecting wire.

Explanation

For conducting sphere, capacitance `prop` radius.
Here, `C_(1)=2C, Q_(1)=Q, C_(2)=C, Q_(2)=0`
Common potential: `V=(Q+0)/(2C+C)=(Q)/(3C)` final charge on sphere of radius `2R:`
`Q'_(1)=C_(1)V=2C.(Q)/(3C)=(2Q)/(3)`
cahrge flown through wire
`Q_(1)-Q'_(1)=Q-(2Q)/(3)=(Q)/(3)`