Question

What are the factors affecting mutual inductance of a pair of coils define coefficient of coupling?

Answer 1

The inductance of a coil is subject to many factors. The length of the coil is one of the factors. If all the factors are kept constant a greater inductance can be achieved by a short coil. The vice versa is also true. The coil area is the second factor. If a coil has less area then the inductance will be less and vice versa. Moreover, the number of coil wraps affect its inductance in that all factors kept constant, if the number of coil turns is greater, then there is high inductance and vice versa. The coefficient of coupling refers to the magnetic flux fraction emanated by a specific coil that has a link with another coil.