# A current  A flows in a ring of radius  cm made of a very thin wire. The tensile strength of the wire is equal to  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  (in T) at which the ring is broken

## Question ID - 153950 :- A current  A flows in a ring of radius  cm made of a very thin wire. The tensile strength of the wire is equal to  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  (in T) at which the ring is broken

3537

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For the equilibrium of a small part of semicircular arc subtending angle of  at the centre,

or,

T

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Two circular coils and , having equal number of turns and carrying currents in the same sense, subtend same solid angle at point . If the smaller coil  is midway between  and  and if we represent the magnetic induction due to bigger coil  at  as  and that due to smaller coil  at  as , then find the ratio