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| 184_notes:perm_mag [2021/06/16 18:47] – [Magnetic Field from a Bar Magnet] bartonmo | 184_notes:perm_mag [2021/06/16 18:48] – [Magnetic Field from a Bar Magnet] bartonmo |
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| [{{ 184_notes:Week9_12.png?400|Magnetic vector field about a permanent bar magnet}}] | [{{ 184_notes:Week9_12.png?400|Magnetic vector field about a permanent bar magnet}}] |
| Since the magnetic field is a vector field, **it has both a magnitude and a direction at every location in space**, which we can represent with an arrow at various points around the magnet. Closer to the poles of the magnet, the field is much stronger, which we represent with longer arrows. By convention, we say that the direction of the magnetic field points away from the north pole and in towards the south pole outside of the magnet (note that the magnetic fields from the atoms inside the magnet point from the south pole to the north pole). So in lieu of carrying iron filings around with us, we represent the magnetic field of bar magnet as shown in the figure. (You may notice that these magnetic field lines look very similar to those of an [[184_notes:pc_force|electric dipole]].) | Since the magnetic field is a vector field, //it has both a magnitude and a direction at every location in space//, which we can represent with an arrow at various points around the magnet. Closer to the poles of the magnet, the field is much stronger, which we represent with longer arrows. By convention, we say that the direction of the magnetic field points away from the north pole and in towards the south pole outside of the magnet (note that the magnetic fields from the atoms inside the magnet point from the south pole to the north pole). So in lieu of carrying iron filings around with us, we represent the magnetic field of bar magnet as shown in the figure. (You may notice that these magnetic field lines look very similar to those of an [[184_notes:pc_force|electric dipole]].) |
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| ===== Measuring Earth's Magnetic Field and other Magnetic Fields ===== | ===== Measuring Earth's Magnetic Field and other Magnetic Fields ===== |