Physics
What is the change in the angular momentum of a system as per the Law of Conservation of Angular momentum, if the total external torque acting is zero?

Remains constant
Increases exponentially
None of these
Becomes zero

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Physics
A cyclist leans inwards when he is negotiating a curve so that

He may increase his speed
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
His weight may be reduced
No frictional force may be produced between the wheels and the axle

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