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--- 184_notes:magnetic_field [2018/08/09 19:35] – [Model of a moving point charge] curdemma
+++ 184_notes:magnetic_field [2021/07/06 17:30] – bartonmo
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 Chapters 17 and 20 of Matter and Interactions (4th edition)
-[[184_notes:conservation_theorems|Next Page: Conservation Theorems]]
+/*[[184_notes:conservation_theorems|Next Page: Conservation Theorems]]
-[[184_notes:electric_field|Previous Page: The Electric Field]]
+[[184_notes:electric_field|Previous Page: The Electric Field]]*/
 ===== The Magnetic Field =====
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 {{youtube>gOrcYltPW3E?large}}
-==== Model of a moving point charge ====
+===== Model of a moving point charge =====
 [{{  184_notes:bfieldpoint.png?200|Magnetic field from a moving point charge}}]
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 ==== Collections of moving charges ====
-{{  184_notes:week9_5.png?300}}
+[{{  184_notes:week9_5.png?300|Magnetic field from a line of charge}}]
 A single moving charge is certainly not the only kind of situation that we encounter. In fact, it's quite often that a collection of charges are moving -- forming a current. This collection of moving charges or really [[184_notes:b_current|current also generates a magnetic field]], and, similar to the electric field, the magnetic field obeys superposition. The basic premise is quite similar to the for electric fields,
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 ==== Effects and Applications ====
 The fact that moving charges generate magnetic fields, that they superpose, and that other moving charges experience magnetic forces in the presence of a magnetic field result in a number of different magnetic phenomenon. Some are quite practical. Some of the most important ones are discussed below:
-{{  184_notes:bfieldlongwire.png?200}}
+[{{  184_notes:bfieldlongwire.png?200|Magnetic field around a current carrying wire}}]
 === Current-carrying wires ===
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 === Curved motion ===
-{{  184_notes:week11_5.png?300}}
+[{{  184_notes:week11_5.png?300|Motion of a charge moving through a magnetic field}}]
 Magnetic fields [[184_notes:q_path|cannot change the kinetic energy of charged particles]]. This is because the magnetic force acting on the particle is always perpendicular to motion of the particle. So magnetic fields can change the trajectory of a particle, but are not able to speed up or slow down the motion of the particle. As a result a particle moving in a uniform magnetic field subject to no other forces will execute [[184_notes:q_path|uniform circular motion]]. The direction of the orbit (clockwise vs counterclockwise) will depend on the sign of the charge, the direction of the velocity, and the direction of the magnetic field.