Two identical conduction spheres, one having an initial charge +Q and the other initially uncharged, are brought into contact.
(a) What is the new charge on each sphere?
(b) While the spheres are in contact, a positively chaged rod is moved close to one sphere, causing a redistribution of hte charges on the two spheres so the charge on hte sphere closest to the rod has a charge-Q. What is the charge to the other sphere?

Explanation

(a) This is due to the reason that the spheres are identical land they share the total charge equally.
(b) The charge on other sphere will be +Q. Because of induction the charge on other sphere will be +Q.