The current in the windings of a toroidal solenoid is 2.05 A. There are 880 turns, and the mean radius is 23.0 cm. The toroidal solenoid is filled with a magnetic material. The magnetic field inside the windings is found to be 1.70 T. Calculate the magnetic susceptibility of the material that fills the toroid. Round your answer to the nearest integer.
With what formula can I solve this?