A superconducting solenoid is to be designed to have an interior field of B= 29T with a maximum current of I=1000A. How many windings are required on…

A superconducting solenoid is to be designed to have an interior field of B= 29T with a maximum current of I=1000A. How many windings are required on a 1-meter solenoid lenth? Answer in units of m^-1…. what does it mean when it says answer in units of m^-1? how can I find that?