Owing to the Meissner effect, a small permanent magnet is seen to levitate above a high-temperature superconductor that has been cooled with liquid nitrogen. A video camera is used to project a close-up view on the wall or screen for the class to see. Apparatus is available for measuring the resistance and temperature of the superconductor.

Immerse the superconductor in nitrogen until the nitrogen stops bubbling, at which point it'll be at temperature. Place the superconductor on a foam surface to minimize thermalization rate. Carefully place a neodymium magnet on top of the superconductor. You'll feel a magnetic force as you push it close. With patience, you should get the permanent magnet to levitate.

B3, I2

PIRA DCS 5G50.50