Dipole in Uniform Magnetic Field

Physics

example

Potential energy of a magnet in a magnetic field

If a bar magnet in magnetic moment is deflected from an angle in a uniform magnetic field of induction , the energy stored in reversing the direction is :
Now lets assume that the bar magnetic is initially placed parallel to the field the initial potential energy will be
Now when it is deflected by an angle then


example

Potential energy of a current loop in a magnetic field

A planar coil of area carrying an anti-clockwise current is placed in an extemal magnetic field , such that the normal to the plane is along the line
Area Normal

area
Magnetic field
Current
magnetic moment

Potential energy U


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