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One metallic sphere A is given a positive charge, whereas another identical metallic sphere B of exactly the same mass as A is given an equal amount of negative charge. Then

1. Mass of A and mass of B still remain equal
2. Mass of A increases
3. Mass of B decreases
4. Mass of B increases

Correct answer: Mass of B increases

Solution

Giving a negative charge to sphere B means adding electrons to it, which slightly increases its mass. A positive charge corresponds to removal of electrons, so its mass decreases slightly. Therefore the correct statement is that the mass of B increases.

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