Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A wire of mass 
has the shape of a ring of radius 
. The wire is placed in 
plane and it is free to rotate about a diameter which is parallel to 
-axis and carries a current 
. A uniform magnetic field 
is switched on along 
-axis. Find the angular speed acquired by the ring as it rotates by 
.
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Using conservation of energy
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