Rotational Motion Question 172

Question: If the angular momentum of a particle of mass m rotating along a circular path of radius r with uniform speed is L, the centripetal force acting on the particle is

Options:

A) $\frac{L^{2}}{mr^{2}}$

B) $\frac{L^{2}}{mr}$

C) $\frac{L}{mr}$

D) $\frac{L^{2}m}{r}$

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Answer:

Correct Answer: A

Solution:

[a] From the relation, angular momentum,

$L=mvr$

$v=\frac{L}{mr}$

Centripetal force acting on the particle

$F=\frac{mv^{2}}{r}=\frac{m{{\left( \frac{L}{mr} \right)}^{2}}}{r}=\frac{L^{2}}{mr^{3}}$



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