A long plying record revolves with a spe...

A long plying record revolves with a speed of `33 (1)/(3) "rev min"^(-1)`, and has a radius of 15 cm. Two coins are placed at 4 cm and 14 cm away from the centre of the record. If the coefficient of friction between the coins and the record is 0.15, which of the two coins will revolve with the record ? Take `g = 9.8 ms^(-2)`.

Coin A will revolve but B will not revolve

B will revolve but A will not revolve

None of the coins will revolve

Both coins will revolve

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