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When a mass is rotating in a plane about a fixed point, its angular momentum is directed along :
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- a line perpendicular to the plane of rotation
- the line making an angle of 45° to the plane of rotation
- the radius
- the tangent to the orbit
Correct Option: A
By right hand screw, rule, the direction of Ĺ is ⊥ to the plane containing 
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The mass is rotating in the plane, about a fixed point, thus this plane will contain and the direction of Ĺ , will be ⊥ to the this plane.
