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Question

# Assertion (A): When a solid copper sphere and solid wooden sphere both have same mass are spinning about their own axis with same angular velocity then wooden sphere has greater angular momentum Reason (R): Wood is less denser than copper so radius of wooden sphere is more than that of copper and so also moment of inertia.

A

Both A and R are true and R is correct explanation of A

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B

Both A and R are true and R is not correct explanation of A

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C

A is true and R is false

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D

A is false and R is true

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Solution

## The correct option is A Both A and R are true and R is correct explanation of A Increase in moment of interia for a given for a given angular velocity will increase the angular momentum of the system ∴ L=Iω L∝I [∴ω=constant]. ∴ Both assertion and reason are true.

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