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In the diagram shown the charge +Q is fi...

In the diagram shown the charge `+Q` is fixed. Another charge `+2q` and mass M is projected from a distance R from the fixed charge. Minimum separtion between the two charge if the velocity becomes `1/sqrt3` time of the projected velocity, at this moment is (Assume gravity to be absent)

A

`sqrt(3)/2R`

B

`sqrt(3)R`

C

`1/2R`

D

`4R`

Text Solution

Verified by Experts

The correct Answer is:
A
Using conservation of angular momentum about fixed charged, we have
`(mv sin 30^(@))R=mv_(1)r` or `(v)/(2)R=(v)/(sqrt(3)r`
or `r=(sqrt(3))/(2)R`
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