A conducting ring of mass 2 kg and radius 0.5 
is placed on a smooth horizontal plane. The ring carries a current of 
A. A horizontal magnetic field 
is switched on at time 
as shown. The initial angular acceleration of ring will be
A
40 
B
20 
C
5 
D
15 
Text Solution
Verified by ExpertsThe correct answer is:
A
Magnetic moment of loop
So, axis of rotation is along 
, i.e., along negative 
‐direction.
Moment of inertia of ring about 
‐axis
so 
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