A proton is kept at rest. A positively charged particle is released from rest at a distance `d` in its field. Consider two experiments, one ini which the charged particle is also a proton and in another, a position. In the same time `t`, the work done on the two moving charged particles is

Options

A. same as the same force law is involved in the two experiments .
B. less for the case of a positron , as the positron moves away more rapidly and the force on it weakens .
C. more for the case of a positron , as the positron moves away a larger distance .
D. same as the work done by charged particle on the stationary proton .

Answer

C

Explanation

Force between two protons and a proton and positron is same but work done is given by `W = F xx s ` so distance moved by positron is larger than proton ( positron being lighter in mass than proton will get more accelerated and hence more distance will be travelled by it ) . So work done will be more for positron .