The Big Bang Theory: Helium Prank
1m 24s
magnetic poles
electromagnetism

Sheldon is invited to explain magnetic monopoles to the listeners of the NPR radio channel, and Barry Kripke takes this opportunity to pull a prank on him. Sheldon explains that ordinary magnets have two poles: a north and south. He mentions that cutting a magnet in half would not create a monopole; rather, it would create two smaller magnets, each with its own pole.

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