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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= mu g omega^(2)`

B

`r lt omega^(2)/(mu g)`

C

`r le (mu g)/omega^(2)`

D

`r ge (mu g)/omega^(2)`

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The correct Answer is:
c
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