5G20.30-Magnetic field lines around a magnet

5g2030magnetic_domains_2 5g2030magnetic_domains

Video: Instructor’s video

Description: This demo shows the magnetic field lines of a magnet on the overhead projector.


  • Cow magnet or bar magnet
  • Array of arrows (small compasses)
  • Overhead Projector
  • Electric Magnetizer

Setup Procedure:

  1. If using the bar magnet, use the electric magnetizer to magnetizer it.
  2. Place on the overhead projector and focus.

Demonstration Procedure:

  1. Turn the projector on.
  2. Place the magnet on or near the array of arrows to visually show the direction of magnetic field lines.