Two identical discs are placed one over the other and both are rotating about an axis through their common centre and normal to their plane at an angular velocity ω. If the upper disc is suddenly removed, angular velocity of the other disc is :
A
ω
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B
ω2
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C
2ω
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D
4ω
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Solution
The correct option is C2ω Let the initial MI be I , then final MI will I/2