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electromagnetic Induction: The Production of Electromotive force in a conductor when there is a change in the magnetic flux linkage with coil or when there is a relative motion of the conductor across a magnetic field. Magnetic Flux: Magnetic Flux through an area dS in a magnetic Field B is = B.dS Faraday's Law: When the Flux of a magnetic field through a loop changes, an emf is induced in the loop which is given by : = -d/dt Where = B.dS is the Flux through the loop. The EmF lasts as long as the magnetic Field
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submitted by waterdemon (5140 m) on 16 Sep 2007 14:55:33 IST (51 comments 1577 views)
Faraday's Law Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. No matter how the change is produced, the voltage will be generated. The change could be produced by changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet, etc. Variations of Faraday's Law The concept of Faraday's Law is that any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. No matter how the change is produced, the volt
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submitted by edison (4425 m) on 5 Apr 2008 21:25:02 IST (3 comments 237 views)
MAGNETISM ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT 1. If a metal piece was thought to be a magnet, which one of the following observations would offer conclusive evidence? a. It attracts a magnet b. it repels a magnet c. it attracts a steel screw driver d. it attracts a piece of copper e. none of the above A bar magnet having dipole moment 80 units is cut into two halves of equal length. The moment of each half will be: a. 80 units b. 40 units c. 60 units d. 20 units e. 160 units If t
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submitted by Jyothi (752 m) on 20 May 2007 21:46:30 IST (0 comments 86 views)
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