A coin placed on a rotating turntable just slips if it is placed at a distance of \( 4 \mathrm{~...

A coin placed on a rotating turntable just slips if it is placed at a distance of \( 4 \mathrm{~cm} \) from the centre. If the angular velocity of the turntable is doubled, it will just slip at a distance of
(a) \( 1 \mathrm{~cm} \)
(b) \( 2 \mathrm{~cm} \)
(c) \( 4 \mathrm{~cm} \)
(d) \( 8 \mathrm{~cm} \).
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