27-28 MagneticField&Sources (1)

27-28 MagneticField&Sources (1) - Chapter 27 Magnetic...

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Chapter 27: Magnetic Fields and Forces Chapter 27: Magnetic Fields and Forces Magnetic Field E F on a moving q Gauss’s Law F mag on I -wire Torque on Loop Chapter 28: Sources of Magnetic Field Ampère’s law Paul Lim Magnetic Field & Sources – 1 / 36
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Magnetic Field Chapter 27: Magnetic Fields and Forces Magnetic Field Magnetic poles Magnetic Field Magnetic monopoles Moving charges E B : vector field E F on a moving q Gauss’s Law F mag on I -wire Torque on Loop Chapter 28: Sources of Magnetic Field Ampère’s law Paul Lim Magnetic Field & Sources – 2 / 36
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Magnets and magnetic poles Chapter 27: Magnetic Fields and Forces Magnetic Field Magnetic poles Magnetic Field Magnetic monopoles Moving charges E B : vector field E F on a moving q Gauss’s Law F mag on I -wire Torque on Loop Chapter 28: Sources of Magnetic Field Ampère’s law Paul Lim Magnetic Field & Sources – 3 / 36 We are all familiar with magnets, such as bar magnets One end of a bar magnet is called the magnetic north pole , while the other end is called the magnet south pole Opposite poles attract each other, while like poles repel each other An object that contains iron but is not itself magnetised is attracted by either pole of a magnet
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Magnets and magnetic poles Chapter 27: Magnetic Fields and Forces Magnetic Field Magnetic poles Magnetic Field Magnetic monopoles Moving charges E B : vector field E F on a moving q Gauss’s Law F mag on I -wire Torque on Loop Chapter 28: Sources of Magnetic Field Ampère’s law Paul Lim Magnetic Field & Sources – 3 / 36 We are all familiar with magnets, such as bar magnets One end of a bar magnet is called the magnetic north pole , while the other end is called the magnet south pole Opposite poles attract each other, while like poles repel each other An object that contains iron but is not itself magnetised is attracted by either pole of a magnet
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Magnets and magnetic poles Chapter 27: Magnetic Fields and Forces Magnetic Field Magnetic poles Magnetic Field Magnetic monopoles Moving charges E B : vector field E F on a moving q Gauss’s Law F mag on I -wire Torque on Loop Chapter 28: Sources of Magnetic Field Ampère’s law Paul Lim Magnetic Field & Sources – 3 / 36 Comparing with an electric analogue: How a negatively charged comb attracts an insulator
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Magnetic Field Chapter 27: Magnetic Fields and Forces Magnetic Field Magnetic poles Magnetic Field Magnetic monopoles Moving charges E B : vector field E F on a moving q Gauss’s Law F mag on I -wire Torque on Loop Chapter 28: Sources of Magnetic Field Ampère’s law Paul Lim Magnetic Field & Sources – 4 / 36 By analogy to electric interactions, we describe the above interactions by saying that a bar magnet sets up a magnetic field in the space around it A second body (such as a second magnet or iron object) then responds directly to that field
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Do magnetic monopoles exist?
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