A U-shaped wire has a semicircular bending between \( A \) and \( B \) as shown in figure. A bea...

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A U-shaped wire has a semicircular bending between \( A \) and \( B \) as shown in figure. A bead of mass \( m \) moving with uniform
\( \mathrm{P} \) speed \( v \) through a wire enters the

W semicircular bend at \( A \) and leaves at \( B \) with velocity \( v / 2 \) after time \( T \). The average force exerted by the bead on the part \( A B \) of the wire is
(1) 0
(2) \( \frac{3 m v}{2 T} \)
(3) \( \frac{3 m v}{T} \)
(4) none of these
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