1. The problem statement, all variables and given/known data You want to make a solenoid that is 38 cm long with 4300 turns. How much current should you run through the solenoid to produce a magnetic field of .75 T? 2. Relevant equations B = uoNI 3. The attempt at a solution I converted 38 cm to m (not sure where to use this number). i used the above equation but got it wrong. I have looked all in my textbook and cant find any other equation to use. help!