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 abo a proton and in another a positron. In
the same time t, the work done on the two moving charged particles is [NCERT Exemplar]

Moderate

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

Solution

Force between two protons is same as that of between proton and a positron.
As, positron is much lighter than proton, it moves away through much larger distance as compared to proton.
We know that, work done = force x distance.
As forces are same in case of proton and positron but distance moved by positron is larger, hence work done will be more.

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