A positive point charge q is placed at the center of an uncharged metal sphere insulated from the ground. The outside of the sphere is then grounded as shown. Then the ground wire is removed. A is the inner surface and B is the outer surface. Which statement is correct?
a.
The charge on A is ?q; that on B is +q.
b.
The charge on B is ?q; that on A is +q.
c.
The charge is 
on A and on B.
d.
There is no charge on either A or B.
e.
The charge on A is ?q; there is no charge on B.
e
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