. Electronic apparatus for biological research . Figure A/, turns A/2turns Figure Tightly coupled mutual inductance If an iron core be used to guide magnetic flux so that nearly all the lines of force due to current in one coil of a mutual inductance thread the turns comprising the other, then the two windings are said to be 'tightly coupled'; this is in contradistinction to the state of aff'airs where the coils are some way apart, no core is provided, and the windings are said to be 'loose coupled'. Most mutual inductances occurring in electrobiology are tightly coupled ( transf
. Electronic apparatus for biological research . Figure A/, turns A/2turns Figure Tightly coupled mutual inductance If an iron core be used to guide magnetic flux so that nearly all the lines of force due to current in one coil of a mutual inductance thread the turns comprising the other, then the two windings are said to be 'tightly coupled'; this is in contradistinction to the state of aff'airs where the coils are some way apart, no core is provided, and the windings are said to be 'loose coupled'. Most mutual inductances occurring in electrobiology are tightly coupled ( transformers), but loose coupled circuits are employed when using radio frequency techniques (say, co > 10^) as in the R-F coupled stimulator. Suppose we have two tightly coupled windings, of self inductances L^ and Lg and mutual inductance M. If winding 1 be supplied with any varying current i^ {Figure ) then dzi ^ ^ dt dk dt and so M M Now let the generator of i^ be disconnected, and a generator of any other varying current /g be connected to winding 2, then d/o ""2 - ^2 d/ and ei = M d/g dt 60
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