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  4. A charged particle q is shot towards another charged particle Q (which is fixed) with a speed v . It approaches Q up to the closest distance r and then returns. If q were given a speed 2v , the closest distance of approach would be <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-eemizujyuw4ej5ft.jpg />

Q. A charged particle is shot towards another charged particle (which is fixed) with a speed . It approaches up to the closest distance and then returns. If were given a speed , the closest distance of approach would be

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Solution:

From conservation of mechanical energy

In second case

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