| http://www.w3.org/ns/prov#value | - In this embodiment, adjusting the distance d1 from the plane PLN including the electrodes 2a and 2b to the first exciting coil 3a and the distance d2 from the plane PLN to the second exciting coil 3b allows the inter-electrode electromotive forces E220R and E220R to be almost only electromotive forces based on ???A/???t components.
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