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The strength of the Earth’s magnetic field is about 30 microtesla. The magnets in an MRI machine clock in at about 3 tesla, and the approximate magnetic field of a white dwarf star is about 100 tesla.
So just think about how powerful this 1,200-tesla magnet created by Shojiro Takeyama and his colleagues at the Institute for Solid State Physics at the University of Tokyo.
Rafi Letzter of Live Science writes:
To achieve that intensity, Takeyama and his team pump megajoules of energy into a small, precisely engineered electromagnetic coil, the inner lining of which then collapses on itself at Mach 15 — that’s more than 3 miles per second (5 kilometers per second). As it collapses, the magnetic field inside gets squeezed into a tighter and tighter space, until its force peaks at a tesla reading unimaginable in conventional magnets. Fragments of a second later, the coil collapses entirely, destroying itself.
The last time Takeyama switched on his super-strong magnet, it blew out the heavy door of the lab that contained the machinery!