153 Non Conservative Field

The following diagrams summarise some interesting measurements, the outcome of which will probably surprise many people. (the red circle represents the region of alternating magnetic field)

nonConservative1

Note that the voltmeters give different readings even though they are connected across the same two points.

nonConservative2

This is due to the fact that the electric field generated by a changing magnetic field is fundamentally different from the so-called coulomb fields. In an non-coulomb field, where the field is not set up by electrical charges, the field is non-conservative. So moving a charge round one complete circuit actually does not return the charge to the original potential.

It is also useful to note that the “surprising” readings all have the voltmeter forming a loop that encloses the changing magnetic field itself.

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