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What is the ratio of K₁/K₂ for a ring and disc?

1. √2:1
2. 1:√2
3. 1:1
4. 2:1

Correct answer: 1:√2

Solution

The radius of gyration (K) for a ring is R, and for a disc is R/√2. The ratio K₁/K₂ = R:(R/√2) = 1:√2.

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