Figure 15. Inductance Factor (Turns)

Electronic Principles
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directly as the crosssectional area of the core increases.

Doubling the radius of a coil increases the inductance by a

factor of four.

inductance of a coil is the length of the coil. Figure 17 on

page 26 shows two examples of coil spacings. Coil (A) has three

turns, rather widely spaced, making a relatively long coil. A

coil of this type has few flux linkages due to the greater

distance between each turn. Therefore, coil (A) has a

relatively low inductance. Coil (B) has closely spaced turns,

making a relatively short coil. This close spacing increases

the flux linkage, increasing the inductance of the coil.

Doubling the length of a coil while keeping the number of turns

the same halves the inductance.