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Faraday Law Supplementary.Doc Essay

4066 words - 17 pages

Workshop: Using Visualization in Teaching Introductory E&M
AAPT National Summer Meeting, Edmonton, Alberta, Canada.
Organizers: John Belcher, Peter Dourmashkin, Carolann Koleci, Sahana Murthy

Faraday’s Law Supplementary Materials


You can find more visualizations at Faraday Law Visualizations. We highlighted two of the visualizations below that complement the workshop activity.

Magnet falling Through a Ring with Zero Resistance show an example of Faraday's Law, as a magnet is dropped through a conducting ring. As the magnet falls under gravity, a current is induced in the ring that tries to keep the magnetic flux through the area of the ring constant. This ...view middle of the document...

If the resistance of the ring is zero, the change in induced flux in the ring will exactly counter the change in external flux due to the external field, thus keeping the total flux constant. Increasing the resistance hinders the flow of induced current, resulting in a delay in the response of the ring to the change in external flux, and a corresponding change in total flux. This can be seen in the flux graph as you manipulate the parameters.


The following ConcepTests illustrate various aspects of Faraday’s Law. They can be used both in class and on exams.

Wire loop in an Increasing Magnetic Field

The magnetic field through a wire loop is pointed upwards and increasing with time. The induced current in the coil is

1. clockwise as seen from the above.
2. counterclockwise as seen from the above.
3. zero.
4. not sure.

Answer: 1. Current is clockwise as seen from above looking down. This direction will produce an “induced” B field generated by the current in the coil that points downward over the area of the wire loop. This “induced” B field is trying to offset the increasing external magnetic field through the wire loop. (Lenz’s Law—the system reacts to try to keep things the same). Note we are ignoring the effects of self induction.

Wire Loop in a Decreasing Magnetic Field

The magnetic field through a circular wire wire loop is pointed upwards and decreasing with time. The induced current in the coil is

1. clockwise as seen from the above.
2. counterclockwise as seen from the above.
3. zero.
4. not sure.

Answer: 2. The current is counterclockwise as seen from above. This direction will produce an “induced” B field generated by the current in the coil that points upward over the area of the wire loop. This “induced” B field is trying to offset the decreasing magnetic field upwards through the wire loop. (Lenz’s Law—the system reacts to try to keep things the same). Note we are ignoring the effects of self induction.

Current and Force on a Wire Loop Moving Through a Changing Magnetic Field A wire loop moves up from underneath a magnet with its north pole pointing upward. Which of the following choices best describes the current in the wire loop as seen from above and the force on the wire loop?

1. Current clockwise and force up.
2. Current counterclockwise and force u p.
3. Current clockwise and force down.
4. Current counterclockwise and down.
5. Not sure.
Answer: 3. The current is clockwise as seen from above and the force is down

The clockwise current implies a self-field of the current in the wire loop that is downward, trying to offset the increase of magnetic flux upwards through the wire loop as it moves upward into a stronger external magnetic field originating from the magnet (Lenz’s Law). The force on the wire loop is a force which is trying to keep the flux through the wire loop from...

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