EM: Magnetic Field LINES

• Physics
• Secondary Education
• Age 13

Forces and Motion 9.1

Magnetic Field Lines

How are you today?

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Highlights of the Day

• describe a magnetic field, and explain that it surrounds a magnet and exerts a force on other magnetic fields

• Values :  Responsibility and Determination

Recall

Magnetic Fields

• A magnetic field is the area around a magnet where the effects of the magnet can be detected.

     EFFECTS:     Attraction or Repulsion

Strongest

Strongest

Strongest

Strongest

The magnetic field is strongest where the lines are closest together.

Rules: Magnetic Field Lines

• join opposite poles
• have arrows that point N     S
• must not touch each other
• must not cross each other

If one magnet is stronger than another, the magnetic field of the stronger magnet will be different in two ways.

•  All the field lines will be closer together.
• The field lines will extend further away from the magnet.

S

N

Apply the Rules: Magnetic Field Lines

Magnetic fields interacting

• Two north poles repel.
• Two south poles repel.
• A north and a south pole attract.

S

N

S

N

S

N

N

S

N

S

S

N

Forces and Motion 9.2

The Earth as a Magnet

Highlights of the Day

• explain that the reason the Earth has a magnetic field is that the core acts as a magnet

• Values :  Responsibility and Determination

The Earth's Magnetosphers

Magnetic fields interacting

• Two north poles repel.
• Two south poles repel.
• A north and a south pole attract.

Self-survey: Rate your level of understanding and participation in this lesson.

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