EM: Magnetic Field LINES

• Physics
• Secondary Education
• Age 13

Magnets and Magnetic Field Lines

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

The Earth's Magnetosphers

Which materials are magnetic?

1. Iron and aluminium
2. Iron, Nickle, Cobalt and steel
3. Iron, Copper and Aluminium
4. Iron, Nickle, Cobalt and Aluminium

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 in this lesson.

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