52. A wire is bent into a three-quarter circular loop of radius R and carries a steady current I. It is placed in a uniform magnetic field perpendicular to the plane of the three-quarter circular loop. The magnitude of net magnetic force on the wire is ______. 
(A) 0
(B) πRIB
(C) 2RIB
(D) (3/4)πRIB
(E) √2 RIB

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