They can induce current in wire and supply torque for electric motors. Maglev trains use magnetic propulsion to travel at high speeds, and magnetic fluids help fill rocket engines with fuel. Earth's magnetic field, known as the magnetosphere, protects it from the solar wind. According to Wired...
Depending on the shape and orientation of their edges, graphene nanostructures (also known as nanographenes) can have very different properties—for example, they may exhibit conducting, semiconducting or insulating behavior. However, one property has so far been elusive: magnetism. Together with collea...
When you realize that the Earth's magnetic field measures 0.5 gauss, you can see how powerful these magnets are. Most MRI systems use a superconducting magnet, which consists of many coils or windings of wire through which a current of electricity is passed, creating a magnetic field of up ...
If you hook that second coil of wire to a voltmeter, you can actually see the needle or readout change whenever you connect or disconnect the wires from the battery. That's because exposing a coil of wire to a changing magnetic field can induce electricity to flow through that wire. The...
Both kinds of machine (they are virtually identical) work on the idea that you can use electricity to make magnetism or magnetism to make electricity. To make electricity, all you have to do is move an electrical conductor (like a copper wire) through a magnetic field. That's it! It's...
In that case, the manufacturer sets a high price for green products to induce consumers to buy brown products (see Proposition 2). Corollary 2. Under direct selling, when α 1 = 1 , the optimal pricing strategy of the manufacturer: (1) If α 2 − c g − c v 2 α 2 > 1 ...
In the EMS system, which uses standard electromagnets, the coils only conduct electricity when a power supply is present. By chilling the coils at frigid temperatures, Japan's system saves energy. However, the cryogenic system used to cool the coils can be expensive and add significantly to ...
Faraday loved to read and he worked his way through the books that he was binding, developing a keen interest in chemistry, electricity and magnetism. His newfound interest in science led him to attend a series of four lectures by chemist Humphry Davy, where he took extensive notes in the ...
power microwave weapon located at some distance from the targets. Power decreases dramatically with distance through theinverse square law, which means one of these devices could produce a power level at the target that would be too low to affect electronics but that could induce the...
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