There are several factors which affects the inductance of a coil which are listed below.
- Number of turns (N) of the coil
- Cross-sectional area (A) of the coil
- Length(L) of the coil
- Permeability (µ) of the core of the inductor.
Number of Turns (N)
The more number of turns (N) of the inductor, it has more inductance and vice-versa keeping all other factors constant. The inductance of the coil is directly proportional to the square of the number of turns of the coil.
Length of the Coil (L)
The longer the length of the coil (L) of the inductor, it has less inductance and vice-versa keeping all other factors constant. The longer length of the coil causes more opposition to the current because of more induced emf in the coil as a result, the magnetic flux linking in the coil is less. Thus, the less flux linkage in the coil leads to less inductance and hence inductance of the coil is inversely proportional to the length (L) of the coil.
Cross-sectional Area of the Coil (A)
The more the cross-sectional area (A) of an inductor, it has more the inductance and vice versa keeping all other factors constant. The coil with more cross-sectional area has less opposition to the flux linking to it. Thus if the cross-sectional area of the coil is more, it has more inductance and hence, the inductance of the coil is directly proportional to cross sectional area (A) of the coil.
Permeability (µ) of the Core of the Inductor
The inductance of a coil can be increased by increasing the permeability of the medium. The iron core inductor has more inductance than an air core inductor. It is because the permeability of the iron core inductor is more than the permeability of the air core inductor.
Conclusion
Hope, you have clearly understand about all the factors affecting the inductance of a coil. Make sure to leave your opinion and suggestion about this post in the comment section below.