Consider a thin conducting shell of radius `R` carrying total charge `Q`. Two point charges `Q` and `2Q` are placed on points `A` and `B`, which are at a distances of `R/2` and `2R` from the center of the cell respectively as shown in the figure. If the cell is earthed how much charge will flow to the eart?

Options

A. `3Q`
B. `Q`
C. `2Q`
D. `Q/2`

Answer

A

Explanation

Since shell is earthed its potential is zero
`(KQ^(1))/R+(K(2Q))/(2R)=0`
`:. Q^(1)=-Q` Hence `3Q` will flow to the earth