# The idea that static magnetic fields might have a therapeutic value has been around for centuries....

###### Question:

The idea that static magnetic fields might have a therapeutic value has been around for centuries. A currently available rare-Earth magnet that is advertised to relieve joint pain is shown in the diagram below. It is 1.0-mm thick and has a field strength of 5.0 times 10^-2 T at the center of the flat surface. The magnetic field strength at points away from the center of the flat surface along the axis is given by B = k / z^3, where z is the distance from the center of the magnet disk. How far from the surface of the disk will be field strength be reduced to that of the Earth (5.0 times 10^-5 T)?

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