Physics Work, Energy, Power and Collision Work Done by Constant and Variable Force MCQ (Single Correct)

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 is which the charged particle is 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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The correct answer is:
C

: Force between two protons = force between a proton and a positron. As positron is much lighter than proton, it moves away a larger distance compared to proton.

As work done = force × distance, therefore in the same time t, work done in case of positron is more than that case of proton.

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