A circular metallic disc of radius \( R \) has a small P circular c...

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A circular metallic disc of radius \( R \) has a small
P circular cavity of radius \( r \) as shown in figure. On

W heating the system
(1) \( R \) increases and \( r \) decreases
(2) \( R \) decreases and \( r \) increases
(3) Both \( R \) and \( r \) increases
(4) Both \( R \) and \( r \) decreases
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