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  4. A current carrying circular coil, suspended freely in a uniform external magnetic field orients to a position of stable equilibrium. In this state:

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Q. A current carrying circular coil, suspended freely in a uniform external magnetic field orients to a position of stable equilibrium. In this state:

EAMCETEAMCET 2005

Solution:

When a current carrying coil is suspended freely in a uniform magnetic field, the magnetic field exerts a force on coil to bring the axis of coil parallel to the direction of field. Since, axis of coil is perpendicular to its plane. Then when axis of coil is parallel to the direction of magnetic field, then plane of coil will be perpendicular to the magnetic field.