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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

A

$mr\alpha t$

B

$mr\alpha$

C

$m\alpha r \sqrt r$

D

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

E

${mr}^2\alpha t$

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