View Order

Electricity and Magnetism

Go back.

5G 10.10 - Assorted Magnets

Demonstrates: Magnetic properties
Description: Various magnets of differing sizes, shapes

5G 10.15 - Lodestone

Demonstrates: Magnetism au natural
Description: This rock is a natural magnet.

5G 20.30 - Magnetic Domain Model

Demonstrates: Electromagnetic fields.
Description: Compasses are placed around a wire. Current is applied and needles are deflected.

5G 40.10 - Hysteresis Loop

Demonstrates: Closed curve in a graph of B versus H.
Description: The magnetic field intensity is first increased and then decreased causing the loop.

5G 50.50 - Meissner Effect

Demonstrates: Levitation of a magnet above a superconductor.
Description: A superconducting disc is chilled in liquid nitrogen. A magnet at rest on the disc will rise and levitate as the disc transitions into the superconducting state. Internal magnetic fields are expelled and surface currents are set up (Meissner effect). The magnet can be moved in mid-air and can be spun around, inducing surface currents which prevent magnetic fields from penetrating the superconducting disc.