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Fleming Left Hand Rule Right Hand Rule
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Fleming′s Left Hand Rule Also known as the Motor Rule this is a way of determining the direction of a force on a current carrying conductor in a magnetic field. The thumb, the first and the second fingers on the left hand are held so that they are at right angles to each other. If the first finger points in the direction of the magnetic field and the second finger the direction of the current in the wire, then the thumb will point in the direction of the force on the conductor. Fleming's right hand rule Fleming's right hand rule (for generators ) shows the direction of induced current flow when a conductor moves in a magnetic field . The right hand is held with the thumb , first finger and second finger mutually perpendicular to each other {at right angles}, as shown in the diagram . The Thumb represents the direction of Motion of the conductor.
Transcript of Fleming Left Hand Rule Right Hand Rule
Fleming′s Left Hand RuleAlso known as the Motor Rule this is a way of determining the direction of a force on a current carrying conductor in a magnetic field.
The thumb, the first and the second fingers on the left hand are held so that they are at right angles to each other.
If the first finger points in the direction of the magnetic field and the second finger the direction of the current in the wire, then the thumb will point in the direction of the force on the conductor.
Fleming's right hand rule
Fleming's right hand rule (for generators)
shows the direction of induced current flow when a conductor moves in a magnetic field.
The right hand is held with the thumb, first finger and second finger mutually
perpendicular to each other {at right angles}, as shown in the diagram .
The Thumb represents the direction of Motion of the conductor.
The First finger represents the direction of the Field. (north to south)
The Second finger represents the direction of the induced or generated Current (the
direction of the induced current will be the direction of conventional current; from positive to negative).
One particular way of remembering the rule is the "FBI" acronym for Force(or
otherwise motion), B as the magnetic field sign and I as the current. The subsequent letters
correspond to subsequent fingers, counting from the top. Thumb -> F; First finger -> B; Second finger -> I
Faraday's LawAny 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.
Lenz's LawWhen an emf is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced emf is such that it produces a current whose magnetic field opposes the change which produces it. The induced magnetic field inside any loop of wire always acts to keep the magnetic flux in the loop constant. In the examples below, if the B field is increasing, the induced field acts in opposition to it. If it is decreasing, the induced field acts in the direction of the applied field to try to keep it constant.
