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Creating a magnetic field using electricity is easy: an electric current flowing in a wire generates a magnetic field around that wire.
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When something that conducts electricity sweeps through a magnetic field, a current starts to flow through it (this is the basis of a dynamo).
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Some navies are already testing rail guns, which use huge amounts of electricity to produce a magnetic field which then accelerates projectiles to many times the speed of sound.
ECONOMIST: Electric ships
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Wires with electricity running through them generate magnetic fields.
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What Rand and his colleagues found is that at the right intensity, when light is traveling through a material that does not conduct electricity, the light field can generate magnetic effects that are 100 million times stronger than previously expected.
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The committee said sudden fluctuations in the magnetic field caused by weather in space or nuclear attack, could wipe out electricity and GPS, used by the military and financial markets.
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In this invisible world, tiny particles of gold melt at temperatures several hundred degrees lower than a large nugget, and copper, which is normally a good conductor of electricity, can become resistant in thin layers in the presence of a magnetic field.
ECONOMIST: Small wonders
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Magnetic tapes can degrade within a decade, while hard disks are expensive and need a constant supply of electricity.
WSJ: Scientists Store King Speech, Shakespeare Sonnets in DNA
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Among today's data-storage devices, magnetic tapes can degrade within a decade, while hard disks are expensive and need a constant supply of electricity to hold their information, creating huge need for power for the "data farms" behind cloud computing.
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