One metallic sphere \( \mathbf{A} \) is given positive charge whereas another identical metallic...

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One metallic sphere \( \mathbf{A} \) 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:
(A) mass of \( A \) and mass of \( B \) still remain equals and same
(B) mass of \( A \) increases
(C) mass of B decreases
(D) mass of \( \mathrm{B} \) increases
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