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Per NCERT §6.7.2, the angular momentum L of a particle is zero when which of the following holds?
Aθ between r and p is exactly 45°
BThe particle is far from the origin
CThe particle is moving very fast
Dp lies along the line through origin
Answer & Solution
Correct answer: D. p lies along the line through origin
NCERT §6.7.2: L = r p sin θ = 0 if sin θ = 0. Also zero if p = 0 or r = 0.
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