8B40.50 - Magnetic Field Coupling

Code Number:
Demo Title:
Magnetic Field Coupling
Magnetic Field Coupling
Area of Study:
Stellar Astronomy
Pyrex dish, Lycopodium powder, tennis ball.

Place the tennis ball on the bench and spin it observing that the ball spins for a long period of time.  Place the dish with the Lycopodium powder and water on an overhead projector.  Then position the ball above the dish with water and Lycopodium powder and spin it and allow it to drop into the dish.  Notice that the ball drags a layer of water around with it and slows down fairly quickly.

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