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Fields (Magnetic (\(\phi\), Magnetic field lines are called flux. All…
Fields
Magnetic
Left hand rule: Thumb is Force, Index is B field, Middle finger is Current.
Right hand rule: Fingers are direction of magnetic field, whilst the Thumb is the direct of Current.
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\(\phi\), Magnetic field lines are called flux. All Magnetic fields are dipoles flowing from the north pole to the south pole. Measured in Webbers (Wb).
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\(B\), Flux Density is the Flux per unit area perpendicular to the flux lines. Measured in Teslas. \(\phi = BA\cos\theta\)
As the force is perpendicular to velocity, a charged particle will move in a circle inside a magnetic field.
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Faradays Law states that a changing flux linkage induces an EMF inside the loop. If this loop is a circuit, a current will flow. Lenz's Law states the direction of said current will appear such that it opposes the change that caused it.
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Electrical
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In non-uniform fields, \(E=-\frac{\Delta V}{\Delta r}\)
Field Properties
All fields have both magnitude and direction, represented by field lines.
Density of field lines corresponds to the strength of the field. Equipotentials run perpendicular to field lines and are lines of equal field strength.
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Field Potential is the work required to move a unit field variable from \(r\) distance from the force emitter to an infinite distance away.
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Gravitational
Always radial, always attractive.
Attractive force between all matter, proportional to the product of two objects's mass.
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