Q2 of 48 Page 38

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

We know that, force between two protons is equal to the force


between proton and a positron (∵ their charges are same)


now,


mass of positron = times mass of the proton


greater the mass lesser the distance a particle travels


∴ positron will travel the largest distance


And ,work done=


Force is same in both the cases only distance varies (positron’s


Distance is larger than proton) and


∴work done will be more in case of positron.


Option (c) is correct.

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