Question

Two discs A and B of radii R and 2R respectively are placed on a horizontal surface as shown . Keeping the disc A motionless. Keeping the disc A motionless, disc B is rotated around it without slippage.When the disc B returns to its starting position,the angle by that it has turned is equal to:
1) 3pi
2)4pi
3)8pi
4)6pi

Answer 1

Answer:

1.

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