Is there a magnetic field in the room?

[wisp]

Consider this:
A long stream of electrons moves very slowly (0.1mm/s) through space, passing through the ceiling of a room and out through the floor. A stationary observer sits on a chair holding a card with iron filings on it. The card is tapped as the electron stream passes though a hole in its centre, and the iron filings form a circular pattern indicating the presence of circular magnetic lines of force.
The stationary observer says “Yes there is a magnetic field and the evidence is shown by the movement of the iron filings”.
Now, according to special relativity, an observer that moves very slowly with the charge will say there is no magnetic field, because the iron filings on his moving card do not move. So he says “The a magnetic field does not exist”.

According to SR the answer is YES and NO.

Is it not possible that magnetic fields always forms when electrons move through absolute space and that a moving observer’s instrument develops its own field, which prevent it making an absolute measurement, hence only relative measurements are detected.
For a solution for absolute motions of electric and magnetic forces, see:
http://www.kevin.harkess.btinternet....wisp_ch_8.html
This solution suggests that magnetic fields always exist when electrons move through absolute space, regardless of an observers relative motion. It is only the motion of the observer that determines whether or not they can be detected.

The simple question is this. Is there a magnetic field in the room? Yes or No?

The answer must be YES.

[AntonioLao]

Even without the electrons, geomagnetism can be detected anywhere on the surface of the earth. This field has an absolute value of half a gauss.

The orientation of a compass needle inspired Einstein in his quest for a TOE. His was the unification of EM field and gravitational field. But he didn't know that there were 2 more fields needed, namely the weak and strong force field.

From a quantum field point of view:

the unit quantum of EM field is the photon.
the unit quantum of gravity field is the graviton.
the unit quantum of weak field are the W+,W-, and Z0.
the unit quantum of strong field are the 8 gluons.

the photon is related to the electron by the effects of QED.