A uniform current carrying ring of mass m and radius R is connected by a massless string as shown. A uniform magnetic field B 0 exist in the region to keep the ring in horizontal position, then the current in the ring is ( λ = length of the string) -
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Torque due to magnetic field
Torque due to weight about the point where string is connected
..(ii)
If ring remains horizontal, then 
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