A current I = 10A flows in a ring of radius r 0 =15 cm made of a very thin wire. The tensile strength of the wire is equal to T = 1.5 N. The ring is placed in a magnetic field, which is perpendicular to the plane of the ring so that the forces tend to break the ring. Find B at which the ring is broken.
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(1 T)
Sol. For the equilibrium of a small part of semicircular arc subtending an angle of 
at the center,
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