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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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Electric field induced in a spherical volume conductor from arbitrary coils: application to magnetic stimulation and

H Eaton1

  • 1Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723.

Medical & Biological Engineering & Computing
|July 1, 1992
PubMed

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
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