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A U-shaped smooth wire has a semi-circul...

A U-shaped smooth wire has a semi-circular bending between A and B as shown in fig. A bead of mass m moving with uniform speed v through the wire enters the semiculcular bent at A and leaves at B. Find the average force exerted by the bead on the part AB of the wire.

A

`0`

B

`(4 mv^2)/(pi d)`

C

`(2mv^2)/(pi d)`

D

`(mv^2)/(pi d)`

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The correct Answer is:
B
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