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. At the same time t, the work done on the two moving charged particles is
| 1. | same as the same force law is involved in the two experiments. |
| 2. | less for the case of a position, as the position moves away more rapidly and the force on it weakens. |
| 3. | more for the case of a position, as the position moves away from a larger distance. |
| 4. | same as the work done by cha particle on the stationary proton. |
(c) Hint: Apply the concept of work.
Step 1: Find the force in two cases.
Force between two protons is the same as that of between proton and a positron.
Step 2: Find the work done in each case.
As positron is much lighter than a proton. it moves away through a much larger distance compared to proton.
We know that work is done = force x distance. As forces are the same in the case of proton and Position but distance moved by position is larger, hence, work done will be more.
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