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Because the string is massless, the pendulum's moment of inertia comes from the:
ASupport alone
BAir alone
CBob alone
DString alone
Answer & Solution
Correct answer: C. Bob alone
1. Moment of inertia sums mass times distance squared.
2. A massless string contributes nothing.
3. So only the bob counts.
_Source: NCERT Class 11 Physics Part II, Chapter 14, Oscillations._
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