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  4. A current carrying coil is subjected to a uniform magnetic field. The coil will orient so that its plane becomes

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Q. A current carrying coil is subjected to a uniform magnetic field. The coil will orient so that its plane becomes

AIPMTAIPMT 1988Moving Charges and Magnetism

Solution:

A current carrying coil behaves as a magnetic dipole. Therefore, in a uniform magnetic field coil will get aligned such that the dipole moment of the coil is parallel to the magnetic field. And we know that dipole moment of a coil is perpendicular to its plane. Therefore, coil will align itself such that its plane is perpendicular the direction of magnetic field.