Distributed Capacity of Single-Layer Coils

The results of previous work done on the distributed capacity of single-layer coils are briefly outlined. Previous theory and experiment do not agree. The reasons for this disagreement are discussed. Two important parameters were omitted from previous theory. The theoretical part of the present paper yields a formula which includes these two additional parameters. This formula is substantiated by experimental evidence and gives the internal capacity of short single-layer coils. By a short single-layer coil, the author means one whose length of winding is, at most, of about the order of the diameter of winding. Any capacity due to leads or terminals should not be considered as part of the internal coil capacity but should be treated separately.