A uniform heavy disc is rotating at constant angular velocity 
about a vertical axis through its centre and perpendicular to the plane of the disc. Let L be its angular momentum. A lump of plasticine is dropped vertically on the disc and sticks to it. Which of the following will be constant
A
B
and 
both
C
L only
D
Neither 
nor 
nor
Text Solution
Verified by ExpertsThe correct answer is:
C
and external torque about the axis 
constant.
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