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. 2021 Jul 25;11(8):248. doi: 10.3390/bios11080248

Table 2.

Electrical parameters of the stimulation coils. Rise/Fall time indicates the time required to transition between 10% to 90%, or 90% to 10%, stimulation strength when the stimulation switches on or off. The transient E-field is estimated by Faraday’s Law of induction during these periods, where the change in flux is estimated based on the predicted experimental 15 A |B| reported in Figure 5f.

Coil Resistance Inductance Rise/Fall Time Transient E-Field
Air Core 2.3 Ω 5.2 mH 5 msec 8.1 V/m
3-Coil System 3.3 Ω 95.1 mH 63.3 msec 659.7 mV/m
Ferromagnetic Core 1.0 Ω 3.7 mH 8.1 msec 7.4 V/m
Pot Core 0.3 Ω 62.3 μH 456.3 μsec 16.6 V/m