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A body of mass m performs U.C.M. along a circular path of radius r with a velocity v. If its angular momentum is L,

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A body of mass m performs U.C.M. along a circular path of radius r with a velocity v. If its angular momentum is L, then its centripetal force is

(A) L2 /mr2 

(B) L2 /mr3 

(C) L2 /mr 

(D) L2 /r3

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Answer is (B) L2 /mr3

L = r p sin θ = r p for U.C.M. [∵ θ = 90°]

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