Aiming to determine how the magnetic field of a perfect toroid having 300 turns varies with distance from the torus center, an electronic circuit engineer sends a 6.00 A current into the toroidal coil. The toroid's internal and external diameters are 16.0 cm and 26.0 cm, respectively. Find the magnetic field magnitude measured by the engineer at i) 6.0 cm, ii) 10.0 cm, and iii) 15.0 cm from the toroid's central axis.

A toroidal transformer used in a modern audio system has N turns of copper wire going around a soft magnetic core as shown below. Is the magnetic field inside the toroidal transformer uniform? Why or why not?

An underwater communication cable has been laid between two islands. The cable is 500.0 m long and has been constructed as a solenoid with 5000 turns. The inductance of the cable has been measured as 100.0 mH. Calculate the magnetic field strength inside the cable when a current of 2.0 A is passed through it.