T.Centuries Earlier, a Danish physicist named Hans Christian Orsted showed that the motion of an electric charge produces magnetism. This was the first observation of widespread events. The charged clouds of particles that float in the universe create a magnetic field between the giant stars. Slashing of molten metal into the Earth’s core produces the planet’s north and south magnetic poles. The firing of nerve cells in the human brain also creates a small amount of magnetism.
The ubiquity of magnetic fields generating such electricity brings problems ranging from practical to specific. The doctors are watching MRI The scan, for example, will have to compensate for the background magnetism. Meanwhile, laboratory scientists who perform accuracy tests may have to create complex shields to obscure any magnetic effect as simple as an electric wire running through the wall of their laboratory.
It will be useful to be able to control, limit or shape the magnetic field remotely. Useful, but obviously impossible. In 1842, the British physicist Samuel Ernshaw showed in mathematics that the maximum strength of a magnetic field could not be beyond its source. In each such field, in other words, it must revolve around the object from the generator. And it wasn’t until things got out of hand that Rosa Macch-Battle of the University of Tonomos in Barcelona found a way around Ernash’s findings. She didn’t really prove him wrong. But she has shown that multiple magnetic fields, each individually following the Irnshaw’s theorem, can bypass it collectively.
As they describe Physical Review Letters, Mach. Much-Battle and his companions surprisingly easily pulled their trick, running 21st from the center of the cylinder, 40 cm. Arrange 20 wires straight next to each other in the form of tall and 8 cm in diameter. When they passed electric current through all 21 wires a complex pattern of magnetic field lines emerged in the surrounding area, forming shapes that vary in the strength and direction of the individual currents.
By choosing the right combination of currents, the researchers found that they could create a sphere that emerged from the virtual version of the 21st wire, not in the center of the cylinder, but 2 cm from it. In other words, if the generating device is curtained by an Oz-style wizard with a curtain cover, it will look at the observer as if the field is nowhere to be seen.
Dr. Mach.Mach-Battle’s demonstration will be a long journey to something that can be used to manipulate distant magnetic fields. But if it can be toured, it goes beyond clearing up potential applications MRI Scan. These types of remote cast fields are used to drive medical nanobots through someone’s bloodstream to deliver drugs to one’s tissues, or to guide a malignant tumor and once it reaches a remote temperature, cook it to death. . Quantum computing is also likely to have an application. Many designs for quantum computers rely on trapping atoms in specific locations in space – a difficult feat that can make this sleeve easier.
The trick still needs refinement. To achieve such desired applications the team needs to be able to sculpt complex magnetic fields in three dimensions. Currently, being limited to simulating the field generated by an electric wire, they cannot do this. But it is worth remembering that Orstead’s original experiment, from which electrical engineering eventually descended, was also simple. It consisted of only a battery, a magnetic compass, and a single wire. Great oaks grow from small acorns.■
This article appeared in the Science and Technology section of the print edition under the title “Outside the Left”
