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Rather than using a beam of light to probe a sample, electron microscopes use a beam of electrons, focused by electromagnets.

And because, according to the basic laws of physics, a circulating current always generates a magnetic field, the graphene disks mutated into tiny electromagnets.

It turns the neutron star into an extremely strong electromagnet.

She steals an electromagnet from the junkyard in order to snag a meteor out of the sky during a shower, for vaguely nefarious power-mad reasons.

To generate the field, a standard scanner employs a large, powerful superconducting electromagnet that pushes a machine’s cost to $1.5 million or more, pricing MRI out of reach of 70% of the world’s population.