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ABCDE is a smooth iron track in the vert...

`ABCDE` is a smooth iron track in the vertical plane. The sections `ABC` and `CDE` are quarter circles. Points `B` and `D` are very close to `C.M` is a small magnet of mass `m`. The force of attraction between `M` and the track is `F`, which is constant and always normal to the track. `M` starts from rest at `A`, then:

A

If M is not leave the track at C then `Fge2mg` .

B

At B, the normal reaction of the track is `F-2mg` .

C

At D =, the normal reaction of the track is `F+2mg` .

D

The normal reaction of the track is equal to F at some point between A and B.

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a, b, c, d
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