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Question

A gramophone record is revolving with angular velocity ω. 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

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Solution

Here friction force provides centripetal force so,

f=mω2r but fμmg

mω2rμmg

rμgω2

Hence, (C) is the correct answer.

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