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A circular metallic disc of radius R has...

A circular metallic disc of radius R has a small circular cavity of radius r as shown in figure. On heating the system

A

R increases and r decreases

B

R decreases and r increases

C

Both R and r increases

D

Both R and r decreases

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • From a circular disc of radius R and mass 9M, a small disc of radius R/3 is removed as shown in figure. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through O is

    A
    `4 MR^(2)`
    B
    `40/9 MR^(2)`
    C
    `40 MR^(2)`
    D
    `37/9 MR^(2)`

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