Atoroidal coil of n turns has a central radius b and a square cross section of side a. find its self-inductance.

Explanation:

As we know that magnetic field due to torroid is given as

this is approximately constant magnetic field along the axis of the torroid

now the flux linked with one coil of the torroid is given as

now total flux of N number of coils is given as

now we know that self inductance is the property of coil in which flux of the coil will link with the current in the coil

So we know that

electrical to thermal

1= 26.17

2= 1.17

3=30.86

4=5.86

just took the assigment on edge