Practice portal › Rotational Motion › Angular Momentum
Asked in CBSE AIPMT 2012 · Angular momentum of a particle
Idea: angular momentum is itself a cross product, ⃗L=⃗r×⃗p.
For motion in a plane, both ⃗r and ⃗p lie in that plane.
A cross product is perpendicular to both of its factors.
So ⃗L is perpendicular to every direction in the plane, which means it lies along the normal to the plane of rotation.
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