A gramophone record is revolving with an angular velocity $\omega$. A coin is placed at a distance $r$ from the centre of the record. The static coefficient of friction is $\mu .$ The coin will revolve with the record if
AIPMT 2010, Medium
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The coin will revolve with the record, if Force of friction $ \ge $ centrifugal force
$\mu mg \ge mr{\omega ^2}$
or$\,\,\,r \le \frac{{\mu g}}{{{\omega ^2}}}$
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