A 178 year old theory, popularly known as ‘Earnshaw’s Theorem’, suggested that there are some specific limitations for the ability of shaping magnetic fields and thus magnetic fields at a distance could not be cancelled. 

Recently, two physicists at the University of Sussex have found a way to falsify this theory to an extent. This means they can effectively cancel magnetic fields at a distance and that too in a way that has practical benefits making them the first ones to do so.

To make this successful, the physicists created a device which comprises a careful arrangement of wires. This specified arrangement of wires creates additional magnetic fields which have the tendency to cancel the unwanted magnetic fields during any experiment. Another distinct feature of this invention is that unlike the previous trials, this works on low frequencies and static fields. This is the feature that unlocks useful applications of this device.

Some of its benefits are:

• It brings about accuracy in the experimental readings of quantum technology and quantum computing.
• It allows the doctors to use magnetic field scanners without any manipulations in the results. This makes the diagnosis of disorders like Alzheimer's much easier and quicker.
• A neuroimaging technique called ‘transcranial magnetic stimulation’ works by activating different areas of the brain through magnetic fields. With the help of this technique, doctors can address the areas required for simulation without any miscalculations.
• It can bring upon a huge improvement in drug delivery and magnetic hyperthermia therapies which are a part of biomedicine.

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