A particle is confined to rotate in a circular path decreasing linear speed, then which of the following is correct?
A
`vecL`(angular momentum) is conserved about the centre
B
only direction of angular momentum `vecL` is conserved
C
it spirals towards the centre
D
its acceleration is towards the centre.
Text Solution
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The correct Answer is:
B
(b) Since v is changing (decreasing), L is not conserved in magnitude. Since it is given that a particle is confined to rotate in a circular path, it cannot have spiral path. Since the particle has two accelerations `a_c and a_t` therefore the net acceleraton is not towards the centre. The direction of `vecL` remains same even when the speed decteases..
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