A particle is describing circular motion in a horizontal plane in contact with the smooth inside surface of a fixed right circular cone with its axis vertical and vertex down. The height of the plane of motion above the vertex is $h$ and the semivertical angle of the cone is $\alpha $ . The period of revolution of the particle
  • Aincreases as $h$ increases keeping $\alpha $ same
  • Bdecreases as $h$ increases keeping $\alpha $ same
  • Cdecreases as $\alpha $ increases keeping $h$ same
  • D
    None of these
Diffcult
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