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A particle of mass $m$ is moving in a circle of radius $r$ with constant angular acceleration $ \alpha $.

Assuming that the particle starts at rest at $t=0$, its angular momentum at any time $t$ is

$ mr\alpha t $

$ mr\alpha $

$ m\alpha r \sqrt r $

$ m\sqrt {\alpha \theta} r $

$ {mr}^2\alpha t $