Physicists could do the ‘impossible’: Create and destroy magnetic fields from afar – Livescience.com

Scientists have figured out a way to create and cancel magnetic fields from afar. 
The method involves running electric current through a special arrangement of wires to create a magnetic field
that looks as if it came from another source. This illusion has real applications: Imagine a cancer drug that could be delivered directly to a tumor deep in the body by capsules made of magnetic nanoparticles. It’s not possible to stick a magnet in the tumor to guide the nanoparticles on their journey, but…

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