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The movement of electrons: Magnetic Fields
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[Need to get permissions for these images -
http://physicsed.buffalostate.edu/SeatExpts/resource/rhr/rhr.htm (loop)
http://www.lanl.gov/news/index.php/fuseaction/1663.article/d/20085/id/13276 (coil)
http://scienceblogs.com/highlyallochthonous/2007/05/geological_basics_the_art_of_p.php (earth and bar magnet)]
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<font size="5" color="white"><strong>The movement of electrons: </strong>Magnetic
Fields</font>
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<img width="98" height="58" src="mainIdea.png">
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Magnetic fields have two main origins. However, regardless of its
origin the field has the same basic properties. One of the more
important properties for this activity is how magnetic fields
interact with charged particles.
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<i><font size="5">A child's magnetic pen toy</font></i>
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<img width="275" height="275" src="youngatart.png">
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<p>
Magnetic fields make possible a number of practical and enjoyable
applications. Magnetic fields are commonly produced in two ways:
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1) Moving <b>delocalized</b> electrons through a conductive material
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<img width="200" height="200" src="coil.jpg">
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<img width="200" height="200" src="loop_of_wire.jpg">
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2) Unequally paired <b>localized</b> electrons in certain magnetic
materials
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<img width="200" height="200" src="earth_magnetic_field.gif">
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<img width="200" height="200" src="bar_magnet.jpeg">
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<font size="5" color="#5c7b67"><b>Magnetic Fields and Charged
Particles</b></font>
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<font size="4">Like electric fields, magnetic fields interact with charged
particles. Magnetic fields move electrons and other charged particles in
circular paths. Use the model below to explore the relationship between
magnetic fields and charged particles like electrons. This model has a
magnetic field already applied that is pointing inward (perpendicular to
the screen). After experimenting with different charged particles and
different magnetic field intensities, try to re-create the images shown
below. </font>
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<font size="4" color="blue"><b>Challenge:</b></font><font size="4"> Try to
re-create the images below using the model above. Note that you can stop
and re-start the model if it will help. Take a snapshot of your best
efforts. </font><br><br>
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<img src="MF_Tangents.png">
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<img src="MF_SnowMan.png">
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<strong>What would you guess is the origin of the magnetic field in this
solenoid?<br><img width="175" height="80" src="solenoid.jpg"></strong>
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delocalized electrons
localized electrons
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<strong>Which of the following would make a charged particle traveling
clockwise in a magnetic field change direction and start moving
counter-clockwise?</strong>
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Changing the particle's charge to the opposite value
Changing the magnetic field intensity from positive to negative
Both the above
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<strong>Which of the following images was created by gradually decreasing
the field intensity from a large positive value to a small positive value?</strong><br>
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