Two concentric conducting thin spherical shells A, and B having radii rA and rBrB>rA are charged to QA and −QBQB>QA The electrical field along a line, (passing through the centre) is

Inside the shell A, electric field Ein = 0At the surface of shell A,EA=kQArA2⟶ (a fixed positive value) Between the shells A and B, at a distance x from the common centreE=k⋅QAx2⟶( as x increases E decreases )At the surface of shell B,EB=k⋅QA−QBrB2⟶ (a fixed negative value because QA