It is one of only two producing foreign fields in China.
This is an operation on fields, that does not always produce a field.
In 1831, it was already known that an electric current produced a magnetic field.
It is often done to produce an electric field that extends out for a significant distance.
Part of that analysis includes measuring the electrical field produced by salt water in a person's head.
That eddy current produces a magnetic field of its own.
Why can a moving charge produce a magnetic field?
They are probably caused by electric fields produced above thunderstorms.
"I'm not sure it'll produce a strong enough field."
These organs produce a weak electric field that may function in communication.
