is: a small coil, that may be used to measure the strength of a magnetic field. [P4.4]
operates: on the basis of electromagnetic induction. Quickly turning the coil within a steady field, or removing it from the field, gives rise to a pulse of current. The total charge that flows in this pulse is proportional to the change in flux linkage, so its measurement by means of a suitably calibrated ballistic galvanometer (or fluxmeter) reveals the magnetic field strength. [P4.4]
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