Gravitational forces that make things fall down to the ... Iron fillings reveal a magnet's magnetic field. You can see a magnet's magnetic field by scattering tiny iron filings around it.

If you took introductory physics, you learned about the “fundamental forces.” It goes something ... This will create a magnetic field, and other wires with electric current will experience ...

How a tokamak works: The electric field ... magnetic confinement devices to manipulate plasmas. The most common fusion reactors of that kind are tokamaks and stellarators. Currently, these are the ...