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Electro-Magnetism © D Hoult 2008
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Magnetic Field Shapes
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Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux
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Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux
These lines show the direction of the force which would act on a free north magnetic pole placed in the field
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Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux
These lines show the direction of the force which would act on a free north magnetic pole placed in the field However, since free north magnetic poles don’t exist... think of the lines as showing which way a very small compass would point if placed in the field
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Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux
These lines show the direction of the force which would act on a free north magnetic pole placed in the field However, since free north magnetic poles don’t exist... think of the lines as showing which way a very small compass would point if placed n the field The “density” of lines on a diagram indicates the strength of the magnetic field
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Field due to a straight current-carrying conductor
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Field due to a straight current-carrying conductor
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It is found that a compass always points perpendicular to the conductor so we conclude that the lines form circles (or cylinders) round the conductor
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To remember the sense of the magnetic field, think about
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To remember the sense of the magnetic field, think about opening a bottle of wine.
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To remember the sense of the magnetic field, think about opening a bottle of wine.
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To remember the sense of the magnetic field, think about opening a bottle of wine.
demo...
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To remember the sense of the magnetic field, think about opening a bottle of wine.
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Field due to a short current-carrying coil of wire
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Field due to a short current-carrying coil of wire
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Field due to a short current-carrying coil of wire
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Field due to a long current-carrying coil of wire (also called a solenoid)
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Field due to a long current-carrying coil of wire (also called a solenoid)
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Field due to a long current-carrying coil of wire (also called a solenoid)
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This field is similar to that of a bar magnet
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This field is similar to that of a bar magnet
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This field is similar to that of a bar magnet
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This field is similar to that of a bar magnet
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Current into plane of diagram
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Current into plane of diagram
Current out of plane of diagram
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Fields due to two parallel current-carrying conductors
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Fields due to two parallel current-carrying conductors
Currents flowing in the same sense
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Fields due to two parallel current-carrying conductors
Currents flowing in the same sense
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Fields due to two parallel current-carrying conductors
Currents flowing in the same sense
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Fields due to two parallel current-carrying conductors
Currents flowing in the same sense
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Fields due to two parallel current-carrying conductors
Currents flowing in the same sense
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Fields due to two parallel current-carrying conductors
Currents flowing in the same sense The two conductors attract each other
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Currents flowing in opposite sense
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Close to the conductors the field is very nearly circular
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The field is similar in shape to the field of a
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The field is similar in shape to the field of a short coil
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The field is similar in shape to the field of a short coil
The two conductors repel each other
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