Question

What is the nature of the magnetic field due to a toroid carrying current?

Answer 1

Answer:

Toroid is a solenoid whose ends are connected to each other. If N is the number of turns and I is the current flowing in the toroid.

line of magnetic field = permeability in vaccum X current penetrated through the loop.

So current penetrated = N*I

And the line integral will be

B *2*π*R

where R = mean radius

So by amperial law

B*2πR= permeability in vaccum*N *I

so B = (permeability in vaccum*N*I)/ 2πR