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One metallic sphere \( \mathrm{A} \) is given positive charge whereas another identical metallic sphere \( B \) of
\( \mathrm{P} \) exactly same mass as of \( \mathrm{A} \) is given equal amount of

W negative charge. Then
(1) Mass of \( \mathrm{A} \) and mass of \( \mathrm{B} \) still remain equal
(2) Mass of \( \mathrm{A} \) increases
(3) Mass of B decreases
(4) Mass of B increases
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