One metallic sphere \[A\] is given positive charge whereas another identical metallic sphere \[B\] of exactly same mass as of \[A\]is given equal amount of negative charge. Then [AMU 1995; RPET 2000; CPMT 2000]

• A.          Mass of \[A\] and mass of \[B\] still remain equal           
• B.          Mass of \[A\] increases           
• C.          Mass of \[B\] decreases           
• D.          Mass of \[B\] increases