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A gramophone record is revolving with angular velocity . A coin is placed at a distance r from the centre of the record. The static coefficient of friction is $μ$ . The coin will revolve with the record if
$r = μ g ω^{2}$
$r < \frac{ω^{2}}{μ g}$
$r \leq \frac{μ g}{ω^{2}}$
$r \geq \frac{μ g}{ω^{2}}$

A

r = μ g ω^{2}

B

r \geq \frac{μ g}{ω^{2}}

C

r < \frac{ω^{2}}{μ g}

D

r \leq \frac{μ g}{ω^{2}}

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