lecture13

# lecture13 - Physics 2102 Aurora Borealis Jonathan Dowling...

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Physics 2102 Physics 2102 Lecture 15 Lecture 15 Magnetic fields Magnetic fields Physics 2102 Jonathan Dowling Star Quake on a Magnetar! “I’ll be back…. Aurora Borealis

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How Do You Use Magnetic Fields in Your Everyday Life!?
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Electric vs. Magnetic Fields Electric vs. Magnetic Fields Electric fields are created: microscopically , by electric charges (fields) of elementary particles (electrons, protons) macroscopically ,by adding the field of many elementary charges of the same sign Magnetic fields are created : microscopically , by magnetic “moments” of elementary particles (electrons, protons, neutrons) macroscopically , by adding many microscopic magnetic moments (magnetic materials); or by electric charges that move (electric currents)
We know that an electric fields exists because it accelerates electric charges, with a force independent of the velocity of the charge, proportional to the electric charge: F E = q E We know that a magnetic field exists because it accelerates electric charges in a direction perpendicular to the velocity of the charge, with a magnitude proportional to the velocity of the charge and to the magnitude of the charge: F B = q v × B Magnetic forces are perpendicular to both the velocity of charges and to the magnetic field ( electric forces are parallel to the field ). Since magnetic forces are perpendicular to the velocity,

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## lecture13 - Physics 2102 Aurora Borealis Jonathan Dowling...

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