Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite...

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Magnetism The shadow of electricity

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Transcript of Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite...

Page 1: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Magnetism

The shadow of electricity

Page 2: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Magnetic Force

Magnets apply forces to each other.

Opposite poles attract, like poles repel.

Page 3: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

CPS Question

The magnitude of the force between magnetic poles

A. is the same at all distances.

B. becomes stronger as the poles come closer.

C. becomes weaker as the poles come closer.

Page 4: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Magnetic Field Lines

Field lines point from North to South pole.

Conventions as with electric field lines.

strong field where lines are close together

direction is direction of force on a north pole

Page 5: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Group Work

1. What happens to a dipole magnet in a uniform magnetic field?

B

N

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Page 6: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Naming the polesN = north-seeking

Earth’s north pole is a south pole!

Page 7: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Current Creates Magnetism

An electric current creates a magnetic field.

Look, Ma! No poles!

Page 8: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Vector Direction Conventions

Up Down

In Out

RightLeft

Page 9: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Poll Question

If a wire in front of you carries a current from left to right, what is the direction of the resulting magnetic field where you are?

I

A. B. C.

D. E. F.

Page 10: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Board Work

An electric current creates a magnetic field whose lines circle right-handed around it. Draw lines for the magnetic field created by a ring of current.

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Page 11: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Magnetic Field of Current Ring

Source: Griffith, The Physics of Everyday Phenomena

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dipole field

Page 12: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Solenoid Magnetic Field

Source: Griffith, The Physics of Everyday Phenomena

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Page 13: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Electrons are Magnets!

spin

Page 14: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Electrons are Magnets!

current

Page 15: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Electrons are Magnets!

magnetic field

Page 16: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Electrons are Magnets!

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magnetic dipole

Page 17: Magnetism The shadow of electricity. Magnetic Force Magnets apply forces to each other. Opposite poles attract, like poles repel.

Types of Magnets

• Electromagnets– currents travel through conducting coils

• Permanent Magnets– materials whose electrons have aligned spins

or orbits

Moving charges create the fields!


A permanent magnet has a north magnetic pole and a south magnetic pole. Like poles repel; unlike poles attract.

A permanent magnet has a north magnetic pole and a south magnetic pole. Like poles repel; unlike poles attract.

Magnets. Magnetic poles Magnets have two poles with opposite polarity (north and south poles).

Magnets. Magnetic poles Magnets have two poles with opposite polarity (north and south poles).

blogsaverroes.juntadeandalucia.es · Use the stickers. The magnets attract. The magnets repel. We use magnets to hold things together. There are magnets on the fridge door to keep

blogsaverroes.juntadeandalucia.es · Use the stickers. The magnets attract. The magnets repel. We use magnets to hold things together. There are magnets on the fridge door to keep

Chapter 20 Magnetism. 20.1 Magnets and Magnetic Fields Magnets have two ends – poles – called north and south. Like poles repel; unlike poles attract.

Chapter 20 Magnetism. 20.1 Magnets and Magnetic Fields Magnets have two ends – poles – called north and south. Like poles repel; unlike poles attract.

Concept Summary. Magnetic Poles Magnetic forces are produced by magnetic poles. Every magnet has both a North and South pole. Like poles repel,

Concept Summary. Magnetic Poles Magnetic forces are produced by magnetic poles. Every magnet has both a North and South pole. Like poles repel,

8.1 Magnetism - Science Class 3000 · magnetic field that exerts a force on other magnets. 8.1 Magnetism Like magnetic poles repel each other and unlike poles attract each other.

8.1 Magnetism - Science Class 3000 · magnetic field that exerts a force on other magnets. 8.1 Magnetism Like magnetic poles repel each other and unlike poles attract each other.

Electromagnetism...Polarity of bar magnets ( they have two poles : like poles repel, opposite poles attract each other. Magnetic field (How to detect a magnetic field - experiments

Electromagnetism...Polarity of bar magnets ( they have two poles : like poles repel, opposite poles attract each other. Magnetic field (How to detect a magnetic field - experiments

MAGNETISM. Specification Magnetism and electromagnetism Magnetism understand that magnets repel and attract other magnets and attract magnetic substances.

MAGNETISM. Specification Magnetism and electromagnetism Magnetism understand that magnets repel and attract other magnets and attract magnetic substances.

Chapter 20 & 21. Like Poles of a magnet repel; unlike poles attract.

Chapter 20 & 21. Like Poles of a magnet repel; unlike poles attract.

PRE-AP Physics. Magnets have 2 poles (north and south) Like poles repel Unlike poles attract Magnets create a MAGNETIC FIELD around them.

PRE-AP Physics. Magnets have 2 poles (north and south) Like poles repel Unlike poles attract Magnets create a MAGNETIC FIELD around them.

Top Ten List 1. There are North Poles and South Poles. 2. Like poles repel, unlike poles attract. 3. Magnetic forces attract only magnetic materials.

Top Ten List 1. There are North Poles and South Poles. 2. Like poles repel, unlike poles attract. 3. Magnetic forces attract only magnetic materials.

Magnetic Fields and Forces AP Physics B. Facts about Magnetism Magnets have 2 poles (north and south) Like poles repel Unlike poles attract Magnets create.

Magnetic Fields and Forces AP Physics B. Facts about Magnetism Magnets have 2 poles (north and south) Like poles repel Unlike poles attract Magnets create.

Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel.

Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel.

Magnetostatics. Magnets and Magnetic Fields Magnets have two ends – poles – called north and south. Like poles repel; unlike poles attract.

Magnetostatics. Magnets and Magnetic Fields Magnets have two ends – poles – called north and south. Like poles repel; unlike poles attract.

Refresher Basic concept Like poles will repel Unlike poles will attract.

Refresher Basic concept Like poles will repel Unlike poles will attract.

Chapter 16 Magnetism. Magnets Poles of a magnet are the ends where objects are most strongly attracted Two poles, called north and south Like poles repel.

Chapter 16 Magnetism. Magnets Poles of a magnet are the ends where objects are most strongly attracted Two poles, called north and south Like poles repel.

Force, Motion, Energy, Matter. Magnets Magnets have an effect on some materials. Magnets can make things move. Magnets can push/pull or attract/repel.

Force, Motion, Energy, Matter. Magnets Magnets have an effect on some materials. Magnets can make things move. Magnets can push/pull or attract/repel.

Chapter 20 Magnetism. Magnets The ends of a bar magnet are called poles Like poles repel and unlike poles attract Regardless of their shape, all magnets.

Chapter 20 Magnetism. Magnets The ends of a bar magnet are called poles Like poles repel and unlike poles attract Regardless of their shape, all magnets.

Chapter 22 Magnetism. Permanent bar magnets have opposite poles on each end, called north and south. Like poles repel; opposites attract. If a magnet.

Chapter 22 Magnetism. Permanent bar magnets have opposite poles on each end, called north and south. Like poles repel; opposites attract. If a magnet.

Magnets and Electromagnetism Chapter Outline 1.Magnets, magnetic poles, and magnetic force. 2.Magnetic…

Magnets and Electromagnetism Chapter Outline 1.Magnets, magnetic poles, and magnetic force. 2.Magnetic…