A rectangular toroid has 2 000 windings around its core and the core has a height of 0.10 m. The toroid has a self-inductance of 0.040 H. What is the current through the toroid when the energy in its magnetic field is J?
There is a current of 1.2 A in a coaxial cable whose outer radius is five times its inner radius. The copper in the coaxial cable has a magnetic permeability . What is the magnetic field energy stored in a 3.0-m length of the cable?
A 10-H inductor carries a current of mA. Calculate how much ice at could be melted by the energy stored in the magnetic field of the inductor. Use a value of 334 J/g for the latent heat of fusion of ice.