System of Particles and Rotational Motion - Result Question 27
27. A force is acting at a point . The value of for which angular momentum about origin is conserved is :
[2015 RS]
(a) 2
(b) zero
(c) 1
(d) -1
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Answer:
Correct Answer: 27. (d)
Solution:
- (d) From Newton’s second law for rotational motion,
So,
Solving we get