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A gramphone record is revolving with an ...

A gramphone 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.

A

`r =mugomega^(2)`

B

`rltomega^(2)/mug`

C

`r le mug/omega^(2)`

D

`r ge mug/omega^(2)`

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