• November 21, 2021

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• PHY102 Physics II © Dr.Cem Özdoğan

• 28-10 The Magnetic Dipole Moment: 

• MAGNETIC DIPOLE MOMENT
• The direction: grasp the coil with the fingers of your right hand in the direction of current i; the outstretched thumb of that hand gives the direction (RHR).
• The magnitude of is given by

• The coil behaves like a bar magnet placed in the magnetic field.
• Thus, like a bar magnet, a current-carrying coil is said to be a magnetic dipole.
• Assign a magnetic dipole moment

• N: number of turns in the coil
• i: current through the coil
• A: area enclosed by each turn of the coil

• Then the torque on the coil due to a magnetic field can be written as:

• A magnetic dipole in an external magnetic field has an energy that depends on the dipole’s orientation in the field.

U(θ)