Magnetic Field, copper wire, and solenoid problem.

[Alpha Russ Omega]

Hello:
I am having trouble starting this problem.

"20.0 m long copper wire, 2.30 mm in diameter including insulation, is tightly wrapped in a single layer with adjacent coils touching, to form a solenoid of diameter 2.50 cm. What is the field at the center when the current in the wire is 26.0 A? Give the field in Teslas."

I figured I would need to use these equations:

Not sure where to start...

Any help would be greatly appreciated.

 

[Chi Meson]

The trick here is to determine how many turns (N) the wire makes around the solenoid and how long (L) the solenoid is. So, haow many times can 20 meters wrap around this solenoid's circumference?

 

[Alpha Russ Omega]

Thank you for the hint. That helped me solve the problem.