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Magnetism The shadow of electricity

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

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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

S

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.

I

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

N

S

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

N S

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!

N

S

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!


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