$A$ car moves along a circular track of radius $R$ banked at an angle of $30^o$ to the horizontal. The coefficient of static friction between the wheels and the track is $\mu$. The maximum speed with which the car can move without skidding out is

  • A
    ${[gR(\mu + \tan \theta) / (1 - \mu \tan \theta)]}^{1/2}$
  • B
    ${[gR(1 - \mu \tan \theta) / (\mu + \tan \theta)]}^{1/2}$
  • C
    ${[gR(\mu + \sqrt{3}) / (1 - \mu \sqrt{3})]}^{1/2}$
  • D
    None

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