Magnetic Fields

Amplify Magnetic Fields Ch 1 L 1.5

Agenda: 1. SIM warmup 2. SIM investigation of field lines 3. Modeling field lines 4. Article and questions

Use the SIM to determine what happens when you move a compass around a magnet.

Multiple Choice

What happens to the compass needle as you move the compass around?

• The compass needle always points north.

• The compass needle points in random directions.

• The compass needle follows the pattern of magnetic field lines.

• The compass needle’s north pole always points to the north pole of the magnet.

Poll

Do you think that if the magnets were misaligned would they still repel? Or attract instead?

• They would still repel

• They would attract instead

Multiple Choice

What actually happened?

• The magnets still repelled, but with less force.

• The magnets attracted each other instead.

Multiple Choice

What do magnetic field lines look like when objects REPEL?

Multiple Choice

What do magnetic field lines look like when objects ATTRACT?

Multiple Choice

Where do the magnetic field lines start and end when 2 magnets are REPELLING?

• They go in the North pole of 1 magnet and into the South pole of the OTHER magnet. (connecting the 2 magnets)

• They go through the North and South pole of each magnet (magnets are NOT connected by field lines)

Multiple Choice

Where do the magnetic field lines start and end when 2 magnets are ATTRACTING?

• They go in the North pole of 1 magnet and into the South pole of the OTHER magnet. (connecting the 2 magnets)

• They go through the North and South pole of each magnet (magnets are NOT connected by field lines)

Modeling Magnetic Field Lines

Now, you’ll add magnetic field lines to your models of systems of magnets and make any revisions needed to show how your thinking has changed.

Use the "Scribble" tool under the Line menu to draw field lines on your models.

(We will do the attract one together)