# Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009

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### Text of Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009

• Slide 1
• Electro-Magnetism David Hoult 2009
• Slide 2
• Magnetic Field Shapes David Hoult 2009
• Slide 3
• Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux David Hoult 2009
• Slide 4
• 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 David Hoult 2009
• Slide 5
• 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 dont exist... think of the lines as showing which way a very small compass would point if placed in the field David Hoult 2009
• Slide 6
• 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 dont 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 David Hoult 2009
• Slide 7
• Field due to a straight current-carrying conductor David Hoult 2009
• Slide 8
• Field due to a straight current-carrying conductor David Hoult 2009
• Slide 9
• 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 David Hoult 2009
• Slide 10
• To remember the sense of the magnetic field, think about David Hoult 2009
• Slide 11
• To remember the sense of the magnetic field, think about opening a bottle of wine. David Hoult 2009
• Slide 12
• To remember the sense of the magnetic field, think about opening a bottle of wine. David Hoult 2009
• Slide 13
• To remember the sense of the magnetic field, think about opening a bottle of wine. demo... David Hoult 2009
• Slide 14
• To remember the sense of the magnetic field, think about opening a bottle of wine. David Hoult 2009
• Slide 15
• Field due to a short current-carrying coil of wire David Hoult 2009
• Slide 16
• Field due to a short current-carrying coil of wire David Hoult 2009
• Slide 17
• Field due to a short current-carrying coil of wire David Hoult 2009
• Slide 18
• Field due to a long current-carrying coil of wire (also called a solenoid) David Hoult 2009
• Slide 19
• Field due to a long current-carrying coil of wire (also called a solenoid) David Hoult 2009
• Slide 20
• Field due to a long current-carrying coil of wire (also called a solenoid) David Hoult 2009
• Slide 21
• This field is similar to that of a bar magnet David Hoult 2009
• Slide 22
• This field is similar to that of a bar magnet David Hoult 2009
• Slide 23
• This field is similar to that of a bar magnet David Hoult 2009
• Slide 24
• This field is similar to that of a bar magnet David Hoult 2009
• Slide 25
• This field is similar to that of a bar magnet David Hoult 2009
• Slide 26
• Current into plane of diagram David Hoult 2009
• Slide 27
• Current into plane of diagram Current out of plane of diagram David Hoult 2009
• Slide 28
• Fields due to two parallel current-carrying conductors David Hoult 2009
• Slide 29
• Fields due to two parallel current-carrying conductors Currents flowing in the same sense David Hoult 2009
• Slide 30
• Fields due to two parallel current-carrying conductors Currents flowing in the same sense David Hoult 2009
• Slide 31
• Fields due to two parallel current-carrying conductors Currents flowing in the same sense David Hoult 2009
• Slide 32
• Fields due to two parallel current-carrying conductors Currents flowing in the same sense David Hoult 2009
• Slide 33
• Fields due to two parallel current-carrying conductors Currents flowing in the same sense David Hoult 2009
• Slide 34
• Fields due to two parallel current-carrying conductors Currents flowing in the same sense The two conductors attract each other David Hoult 2009
• Slide 35
• Currents flowing in opposite sense David Hoult 2009
• Slide 36
• Close to the conductors the field is very nearly circular David Hoult 2009
• Slide 37
• Slide 38
• The field is similar in shape to the field of a David Hoult 2009
• Slide 39
• The field is similar in shape to the field of a short coil David Hoult 2009
• Slide 40
• The field is similar in shape to the field of a short coil The two conductors repel each other David Hoult 2009

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