A bead of mass m is attached to one end ...

A bead of mass m is attached to one end of a spring of natural length R and spring constant `K=((sqrt(3)+1)mg)/(R )`. The other end of the spring is fixed at a point A on a smooth vertical ring of radius R as shown in fig. The normal reaction at B just after it is released to move is

`(mg)/(2)`

`sqrt(3) mg`

`3 sqrt(3) mg`

`(3 sqrt(3) mg)/(2)`

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