A copper pipe five and a half feet long leans against the wall.

Eddy Current Tube (Long)

Item 263
In service Good - Normal Wear

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9BB100 - Passive Magnetic Components
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Used in demonstrations

Two copper tubes on a green surface — one with viewing holes drilled along its length — alongside a penny and a small gold-colored neodymium disk magnet
Safety

Eddy Currents: Copper Tube

A neodymium magnet falls slowly through a copper tube (~10 seconds for 61 cm) while pennies drop in under a second, dramatically demonstrating Lenz's law and eddy current braking.