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A small coin is placed at a distance r from the centre of a gramophone record. The rotational speed of the record is gradually increased. If the coefficient of friction between the coin and the record is μ , the minimum angular frequency of the record for which the coin will fly off is given by

a
2μgr
b
μg2r
c
μgr
d
2μgr

detailed solution

Correct option is C

conceptualm ω2r=μmgω =μgr

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