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(A) Each current-carrying ring acts as a magnetic dipole with a magnetic moment $\vec{\mu}$ perpendicular to its plane. When currents are set up in th

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The two rings rotate into a common plane

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(A) Each current-carrying ring acts as a magnetic dipole with a magnetic moment $\vec{\mu}$ perpendicular to its plane. When currents are set up in the rings,they experience a magnetic torque $\vec{	au} = \vec{\mu} 	imes \vec{B}$ due to the magnetic field of the other ring. This torque acts to align the magnetic moments of the two rings in the same direction. Since the magnetic moment is perpendicular to the plane of the ring,aligning the magnetic moments means the planes of the two rings will rotate until they become coplanar,with the currents flowing in the same direction to achieve a state of minimum potential energy. Therefore,both rings rotate to reach a common plane.

Two insulated rings,one of slightly smaller diameter than the other,are suspended along their common diameter as shown. Initially,the planes of the rings are mutually perpendicular. When a steady current is set up in each of them:

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