Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities 
and 
. They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
: Initial angular momentum 
Let 
be angular speed of the combined system. Final angular momentum 
According to conservation of angular momentum 
or 
Initial rotational kinetic energy
Final rotational kinetic energy
Loss of energy 
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