when a body becmes negatively charged , its mass

[a] decreases [b] increases

[c] remins the same [d] none of these

correct option b. increases

When a body attains negative charge, it has excess of electrons in it. Electrons has got mass so its mass increases when negatively charged.  

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When a body is negatively charged, electrons are  present  in excess as compared to protons in the body. As a result mass of a negatively charged body will increase since electrons have a definite mass and it is equal to 9.1 X 10-31 Kg.

Hence the correct answer is [b].

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