Faraday's Law - claimed by duql1030: Difference between revisions
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The north pole of a bar magnet points toward a thin circular coil of wire containing 42 turns (see the figure). The magnet is moved away from the coil, so that the flux through one turn inside the coil decreases by 0.1 tesla·m2 in 0.1 seconds. What is the average emf in the coil during this time interval? Viewed from the right side (opposite the bar magnet), does the current run clockwise or counterclockwise? | The north pole of a bar magnet points toward a thin circular coil of wire containing 42 turns (see the figure). The magnet is moved away from the coil, so that the flux through one turn inside the coil decreases by 0.1 tesla·m2 in 0.1 seconds. What is the average emf in the coil during this time interval? Viewed from the right side (opposite the bar magnet), does the current run clockwise or counterclockwise? | ||
[[File:FaradayExample1.jpg|200px]] | [[File:FaradayExample1.jpg|200px]] | ||
Revision as of 17:08, 17 April 2016
Short Description of Topic
The Main Idea
Unlike Coulomb electric field which is produced by charges, Non-Coulomb electric field is electric field along the coil and is associated with changing magnetic field. The non-coulomb electric field is proportional to change in magnetic field and decreases with distance.
Observing the non coulomb magnetic field, voltage (emf) will be "induced" in a coil by any type of change in the magnetic field on/around the coil of wire. The change of magnetic field can be made by changing distance between magnet(source of the magnetic field) and the coil, rotating the coil relative to the magnetic field, putting coil in and out of magnetic field, and etc.
A Mathematical Model
emf = -(number of turns of the coil)*delta(magnetic flux)/delta(t)
magnetic flux = magnetic field * area
Non-coulomb electric field = induced emf / 2*pi*radius of the coil
Examples
Moving Magnet
The north pole of a bar magnet points toward a thin circular coil of wire containing 42 turns (see the figure). The magnet is moved away from the coil, so that the flux through one turn inside the coil decreases by 0.1 tesla·m2 in 0.1 seconds. What is the average emf in the coil during this time interval? Viewed from the right side (opposite the bar magnet), does the current run clockwise or counterclockwise?
Middling
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