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.\tau =0 $ and $ F.\tau \ne 0 $
B) $ r.\tau \ne 0 $ and $ F.\tau =0 $
C) $ r.\tau \ne 0 $ and $ F.\tau \ne 0 $
D) $ r.\tau =0 $ and $ F.\tau =0 $
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Answer:
Correct Answer: D
Solution:
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[d] The torque, $ \tau =r\times F $
As, $ \tau $ is perpendicular to both r and F, so r .
$ \tau $ as well as F .
$ \tau $ has to be zero.
