what is magnetic effect of current?

Answer 1

Use the right hand rule, also known as the rule of thumb. If you have a wire (insulated!) with a current flowing through it, grab the wire in your right hand, with your thumb pointing in the direction that the current is flowing. Your fingers will curl around the wire in the direction of the magnetic field.

If the current alternates (periodically reverse direction) then the magnetic field also alternates. Envision it as a cylindrical zone that has the wire down its axis, and that the cylinder expands and contracts as the current of electrons increases or decreases.

Now, suppose we wrap our wire around a coil form to make a coil. There is also a right hand rule, or rule of thumb, for coils. If you hold the coil (again, use insulated wire!) with your fingers wrapped around it pointing in the direction that the electron current flows, your thumb will point in the direction of the north pole of the coil.

How does that work? Remember, we are imagining the magnetic field as a cylindrical region around the wire. But the surface of the cylinder is rotating. (We'll stick with current in only one direction for the time being. It's easier to follow.) So think of the flow of the magnetic field as rotating around the wire.

Now, if we wrap the wire into a coil, the rotation of the segements of the magnetic field add up in the same direction. They are working together. This is why the field is stronger inside the coil.

We should also think of the magnetic field as composed of individual lines of force that repel one another. That is why, when they exit one end of the coil and return to the other, they spread out in space.

We can see this if we hold a magnet under a sheet of paper or aluminum foil and sprinkle iron filings on top. They cluster most around the poles where the field lines are concentrated-- the field is strongest-- and more thinly around the outside of the magnet, where the field lines spread out, because the field is weaker there. This holds true for any magnet, not just electromagnets.

I hope this is clear enough to help. It is a little tough trying to understand things we can't see.

19 NOV 06, 1816 hrs, GMT.

Answer 2

when some quantity of current flows through a conducter it produces some magnetic field around it. This is the magnetic effect of current.

Answer 3

current passing though a wire creates a magnetic field around it.
If a piece of wire passes through a magnetic field cutting throught the line of the field, a current will be produced in the wire.

Answer 4

Hi. Electrons flowing through a conductor generate a magnetic field which wraps around the wire.

Answer 5

Magnetism is the effect of electromagnetism. All charged debris create electromagnetic field around them. The electromagnetic field could be seen through fact the mixture of an electric field and a magnetic field. the electrical powered field is produced by potential of table certain expenditures, and the magnetic field by potential of shifting expenditures (currents).