What is the Inductance of Parallel Wires in a Circuit?

[Worme]

1. Two wires running parallel to each other in a circuit can provide an inductance that is adjustable with their length. For the loop shown below with length L=2m , width w=5cm , and wire radius a=1mm , find the inductance in H?

Homework Equations

3. I thought i could find the inductance by using the equation mu0/pi(L*ln((w-r)/r) + w*ln((L-r)/r) and i found 3.3*10^-6 but it don't seem good.
Could you help me?

 

[Aceix]

For the loop shown below

Any image?

 

[Worme]

 

[Worme]

Ok i find it,thanks