Question : A heavy small sized sphere is suspended by a string of length 𝑙. The sphere is rotated uniformly in a horizontal circle with the string making an angle θ with the vertical. The time period of this conical pendulum is
(A) 2\pi \sqrt{\dfrac{2\tan \theta }{g}}
(B) 2\pi \sqrt{\dfrac{2\sin \theta }{g}}
(C) 2\pi \sqrt{\dfrac{l}{g}}
(D) 2\pi \sqrt{\dfrac{2\cos \theta }{g}}
Answer : option (D)
Solution :
