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Uniform Circular Motion

The diagram b...

Question

The diagram below shows part of the main scale and vernier scale of a vernier callipers, which is used to measure the diameter of a metal ball. Find the radius of the ball if $10$ divisions on the vernier scale coincide with $9$ divisions on the main scale.

A

2.18 cm

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B

4.37 cm

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C

4.37 mm

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D

2.18 mm

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Solution

The correct option is A $2.18 cm$

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