Two concentric spherical conducting shells of radii R and 2R carry charges Q and 2Q respectively. Change in electric potential on the outer shell when both are connected by a conducting wire isk=14πϵ0
Zero
When two concetric shells are connected by a wire the whole charge on inner shell is transferred to the outer shell. Here, the situation is as shown in figure. On the outer shell
Vi=kQ2R+k(2Q)2R
Vi=3kQ2R
Vf=k(3Q)2R
∴ ΔV=Vi=0