Quenching an MRI magnet. Magnets carrying very large currents are used to produce the uniform, large-magnitude magnetic fields that are required for magnetic resonance imaging (MRI). A typical MRI magnet may be a solenoid that is 2.0  m long and 1.0  m in diameter, has a self-inductance of 4.4 H, and carries a current of 750 A. A normal wire carrying that much current would dissipate a great deal of electric power as heat, so most MRI magnets are made with coils of superconducting wire cooled by
Quenching an MRI magnet. Magnets carrying very large currents are us…
Nov 6, 2020
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Physics Uncovered on Instagram: "What you’re seeing is called quenching — one of the most dramatic processes in metallurgy. A piece of metal, glowing red-hot from being freshly forged, is plunged into water to cool and solidify. This rapid cooling forces the outer layers to contract faster than the inside, creating enormous thermal stress. 💥 At first, the surface is so hot that water instantly vaporizes, forming a layer of steam — the Leidenfrost effect — briefly insulating the metal. Once it c
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