Q: Two bodies are charged by rubbing one against the other. During the process, one becomes positively charged while the other becomes negatively charged. Then
(A) mass of each body remains unchanged.
(B) mass of each body changes marginally.
(C) mass of each body changes slightly and hence the total mass.
(D) mass of each body changes slightly but the total mass remains the same.
Solution: The transfer of electrons from one body to the other results is development of charges.
Hence, no. of electrons given by one body = No. of electrons obtained by the other.
Mass of negatively charged body slightly increases while mass of positively charged body slightly increases.
whereas the total mass of the system remains the same.
Hence (D) is correct.