Two bodies are charged by rubbing one against the other. During the process, one becomes positively charged while the other becomes negatively charged. Then:
Correct answer: D. Mass of each body changes slightly but the total mass remains the same.
- A. The 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.
Explanation
Charging by rubbing involves the transfer of electrons, which have a very small mass. The body that gains electrons will have a slight mass increase, and the body that losesthem will have a slight mass decrease, but the total mass of the two-body system is conserved.
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Electrostatics describes forces between charges through Coulomb's law, electric fields and field intensity, then uses electric potential to measure energy per unit charge. Capacitors store charge and electrical energy, with capacitance depending on geometry and dielectric material, not simply on the amount of charge present.
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