Question 53

A small ring of negligible thickness and radius 2cm moves on a bigger ring of radius 10 cm. How many rotations will the small ring take on the bigger ring to make a complete round ?

Name: A small ring of negligible thickness and radius 2cm moves on a bigger ring of radius 10 cm. How many rotations will the small ring take on the bigger ring to make a complete round ?
Uploaded: 2026-06-14T11:42:27.751636+05:30
Duration: 3 min 49 s
Description: A small ring of negligible thickness and radius 2cm moves on a bigger ring of radius 10 cm. How many rotations will the small ring take on the bigger ring to make a complete round ?

Solution

The perimeter of the smaller ring is $$4\pi\ $$ . The perimeter of the larger ring is $$20\pi\ $$

As we can clearly see, it will take 5 rotations of smaller ring to completely cover the larger circle.

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