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Per NCERT §6.7 (Conservation of L), if the total EXTERNAL torque on a system is zero, the total angular momentum is which?
AOscillates with constant amplitude
BIncreases linearly with time
CAlways zero by construction
DConserved (constant in time)
Answer & Solution
Correct answer: D. Conserved (constant in time)
NCERT §6.7 eqn 6.29: τ_ext = 0 ⇒ dL/dt = 0 ⇒ L conserved. Three independent scalar equations.
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