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 in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is (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.

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