Current needed through solenoid to produce given B field

[Linus Pauling]

1. Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 2.20-mm-diameter superconducting wire.


2. B = mu₀BI / l



3. Is there a way to do this without finding N? Either way, how do I calculate N with the given information?

 

[tiny-tim]

Hi Linus Pauling!

…how do I calculate N with the given information?

It's "tightly wound", and it's 1.8m long …