I know that an emf is induced in a conductor when rotated in a magnetic field but why is it induced? I realsie that a current produced will travel in the opposite direction to the force that produced it buy yet again WHY and HOW is the emf induced? Please explain adequately.
2006-07-25 11:10:06 · 5 answers · asked by surani_ud 3 in Science & Mathematics ➔ Physics
Emf is another way of saying voltage which is a force.
An induced emf is the result of the magnetic field interaction with the electron.
Cutting the magnetic flux with a conductor is what cause the interaction. its simple.
The conductor is rich with free electrons.
2006-07-25 11:19:53 · answer #1 · answered by goring 6 · 3⤊ 0⤋
First see the effect namely when a current is in a conductor, there is a magnetic field around the conductor.
Current implies flow charges (electrons). An emf is the cause for the flow of charges.
As long as there is steady current the magnetic filed around the conductor will not change.
If the current (movement of charges) is changed, the magnetic field changes.
Naturally we expect the reverse effect; when we change the magnetic field, there must be a change in the current in a conductor.
The conductor was initially neutral (no flow of charges). Now due to the change in the magnetic field, electrons move from one side of the conductor to the other side (of course with varying speed). The charges are accumulated on one side. That is that side has a potential or emf.
Changing the magnetic field can be done either by moving the conductor in the field or by moving the magnet keeping the conductor at rest or by moving both.
2006-07-25 22:27:54 · answer #2 · answered by Pearlsawme 7 · 0⤊ 0⤋
A charged particle, moving through a magnetic field, experiences a force in the direction perpendicular to its motion. Imagine a bar of some electrical conductor--any material which contains easily moved charges--flying through such a field. The charges will all be pushed toward one extremity of the bar. This happens until the charges' own mutual repulsions balance the "electromagnetic" force. This concentration of charge at one end of the bar creates an electrical force which would tend to push another charge toward the vacant side of the bar. The electrical force is the "induced "EMF".
2006-07-25 19:09:29 · answer #3 · answered by Benjamin N 4 · 0⤊ 0⤋
Because electrons are tiny magnets due to electron spin. This is how NMR works. The electrons tend to follow magnetic lines. MMF. Magneto motive force.
Lenz's Law.
2006-07-25 18:16:59 · answer #4 · answered by helixburger 6 · 0⤊ 0⤋
I like gorin's answer
2006-07-25 18:36:55 · answer #5 · answered by tjc 2 · 0⤊ 0⤋