Superconductors can also help measure the small magnetic fields which are caused by electric current
flowing in our brains.
and Luc Berger of Carnegie Mellon University in Pittsburgh independently proposed a novel twist on the phenomenon: If electron spins are aligned within an electric current
flowing through a magnet, they might exert torques large enough to reorient the magnetization of that magnet.
The electric current
is delivered through the adhesive electrode pads and into the victim's chest.
Embedded in the metal-detector head are three copper coils, When you flip the handle's "on" switch, an electric current
generated by a 9-volt battery flows to the coils and produces a magnetic field, the area around a magnet (metallic object usually made of iron, nickel, copper, or cobalt) that exerts a pushing or pulling force.
In the evacuated tube, certainly, the electric current
seemed to be flowing from the negative.
In the coreless induction furnace, the power coil carries an electric current
which establishes a magnetic field.
It was unclear as to what was conducting the current, but the researchers imagined the electric currents
might run between different bacteria via a joint external wiring network.
As the train moves, the superconducting electromagnets induce (create) electric currents
in these wire coils, making the coils magnetic as well.
The product, tradenamed GlucoWatch, works by sending tiny electric currents
through the skin to measure glucose levels every 20 minutes - even while patients are sleeping.
For example, by carefully monitoring electric currents
, resistances, magnetic fields, and other properties of supercold microstructures, physicists made two Nobel prize-winning discoveries.
Not far off, say the technology's developers, are photonic microcircuits that process light beams the way today's microelectronics chips process electric currents
Microscopic defects on metal surfaces create sites where salt ions carry electric currents
and trigger these oxidizing reactions.