SATHEE: Rotational Motion Question 8

Rotational Motion Question 8

Question: Let F be the force acting on a particle having position vector r and t be the torque of this force about the origin. Then,

[AIEEE 2003]

Options:

A) $r . τ = 0$ and $F . τ \neq 0$

B) $r . τ \neq 0$ and $F . τ = 0$

C) $r . τ \neq 0$ and $F . τ \neq 0$

D) $r . τ = 0$ and $F . τ = 0$

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Answer:

Correct Answer: D

Solution:

[d] The torque, $τ = r \times F$

As, $τ$ is perpendicular to both r and F, so r .

$τ$ as well as F .

$τ$ has to be zero.

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Rotational Motion Question 8

Question: Let F be the force acting on a particle having position vector r and t be the torque of this force about the origin. Then,

Options:

Answer:

Solution:

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