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Two particles A and B are moving in uniform circular motion in concentric circles of radius $r_A$ and $r_B$ with speed $v_A$ and $v_B$ respectively. The time period of rotation is the same. The ratio of angular speed of A to that of B will be:
A
$r_A:r_B$
B
$v_A:v_B$
C
$r_B:r_A$
D
$1:1$