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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

`sqrt3/2R`

B

`1/sqrt3R`

C

`1/2R`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
Let us conserve angular momentum of +2q about the point at +Q.
`mv_1r_1sintheta_1=mv_2r_2sintheta_2`
`(m)(v)(R)sin150^@`
`=m(v/sqrt3)r_(min)sin90^@`
`:. r_(min)=sqrt3/2R`
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