What is the mutual inductance of a two-loop system as shown with centre separatiion `l`?

What is the SI unit of mutual inductance of two coils ?

Mutual inductance & L-C oscillations

L-R circuit and mutual inductance

What is the mutual inductance of a system of co-axial cables carrying current in opposite directions as shown ? Their radii are a and b respectively and its length l .

Find the appoximate formula expressing the mutual inductance of two thin coaxial loops of the same radius a if their centres are separated by a distance l , with l gt gt a

The approximate formula expressing the formula of mutual inductance of two coaxial loops of the same redius a when their centers are separated by a distance l with l gt gt a is

The approximate formula expressing the formula of mutual inductance of two coaxial loops of the same redius a when their centers are separated by a distance l with l gt gt a is