In the figure a charged small sphere of ...

In the figure a charged small sphere of mass `m` and the charge `q` starts sliding from rest on a vertical fixed circular smooth track of radius `R` from the position `A` shown. There exist a uniform magnetic field of `B`. Find the maximum force exerted by track on the sphere during its motion.

`3mg-qBsqrt(2gR)`

`3mg+qBsqrt(2gR)`

`mg-qBsqrt(2gR)`

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