What do the blue circles going around the wire represent?

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asked Sep 1 in Science by Justinfartty (1,650 points)
What do the blue circles going around the wire represent?

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answered Sep 23 by Daltonthreet (4,460 points)
The blue circles going around the wire represent electrons flowing through the wire.

The red circles of a wire represent atomic nuclei.

There is electric current that is in the wire and the electrons that are in the wire are moving to the right.

Magnetic fields arise from charges, similarly to electric fields, but are different in that the charges must be moving.

A long straight wire carrying a current is the simplest example of a moving charge that generates a magnetic field.

The general direction for the magnetic flux flow is from the North ( N ) to the South ( S ) pole.

In addition, these magnetic lines form closed loops that leave at the north pole of the magnet and enter at the south pole.

Magnetic poles are always in pairs.

The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of your right hand would curl if you wrapped them around the wire with your thumb in the direction of the current.

When an electric current passes through a straight wire, it induces a magnetic field.

To apply the right hand grip rule, align your thumb with the direction of the conventional current (positive to negative) and your fingers will indicate the direction of the magnetic lines of flux.

If you move a bar magnet toward a loop of wire, it increases the flux through the loop, which induces a voltage around the loop, which causes an electric current to flow in the wire!

Unlike electricity, magnetic fields do not have charge.

Therefore, the terms positive and negative do not carry the same meaning for magnetic fields as they do for electrical fields.

Gauss's law for magnetism states that there are no “magnetic charges” comparable to electric charges.

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