Question

Figure shows three concentric conducting
spherical shells of radii a, b and c (c> b > a).
The innermost and outermost shell are given
charges Q, and Q, respectively, and the middle
shell has been earthed. Select the correct
alternative(s).
Q₂
Qi
b la
(1) The total charge on middle shell is zero
(2) If |Q,1 > Q2), total charge on middle shell has
opposite sign as that of Q,
(3) The charge on the outer surface of outermost
b
shell is Q
с
(4) The potential at a point outside the outermost
1
Q2
where r is distance from O
shell is
4πεor​