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A particle moves on a straight line with...

A particle moves on a straight line with a uniform velocity. The angular momentum of the particles is

A

Always zero

B

zero about a point on the stright line

C

zero about a point away from the straight line

D

constant always about a given point not on the line

Text Solution

Verified by Experts

The correct Answer is:
B, D
As `L = mv r`, therefore `L = 0`, when `r = 0` i.e. when point lies on the straight line. When a given point does not lie on the line, `r =` consatnt.
Therefore, `L = mv r =` consatnt.
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