And then my hand is curling around the wire. Magnetic field of permanent magnets[ edit ] Main articles: Your thumb is actually the direction of the force. So if I was holding that same wire, we see that my thumb is going in the direction of the current.
The magnitude of that magnetic field is equal to mu-- which is a Greek letter, which I will explain in a second-- times the current divided by 2 pi r. The strength of the magnetic field depends on the current I in the wire and r, the distance from the wire.
An alternative method to map the magnetic field is to 'connect' the arrows to form magnetic field lines. These two models produce two different magnetic fields, H and B. Let's say that we have a wire.
Too, a north pole feels a force in the direction of the H-field while the force on the south pole is opposite to the H-field. Let's say the wire is going along or it's in the plane of your computer monitor.
While if you were whizzing along with it, then that thing would look static. Because if they were positive charges moving, but we know it's a negative charge moving in the opposite direction. Flipping a bar magnet is equivalent to rotating its m by degrees. If the conductor is a wire, however, the magnetic field always takes the form of concentric circles arranged at right angles to the wire.
And it is carrying a current of-- I'm just making up numbers-- 5 amperes, or 5 coulombs per second. Those are the vectors.
Hopefully that makes a little bit of sense. Gauss's law for magnetism The Amperian loop model: I've been doing a lot of magnetic fields that pop out of the screen.The magnetic field is strongest in the area closest to the wire, and its direction depends upon the direction of the current that produces the field, as illustrated in this applet.
Presented in the tutorial is a straight wire with a current flowing through it. The magnetic field lines around an electrified wire form concentric circles around the wire.
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 pointing in the direction of the current. How Do You Measure the Magnetic Field?
the wire, the magnetic field due to the wire will be 90° to the Earth's magnetic field.
both. Magnet Wire | PowerwerxDesign Your Own · Portable Power · Digital Display · Need Help. A long straight wire carrying a current has a magnetic field due to moving charges which will depend on the right-hand rule. For the case of a long straight wire carrying a current I, the magnetic field lines wrap around the wire and depends on the distance to the wire.
The magnetic field is strongest in the area closest to the wire, and its direction depends upon the direction of the current that produces the field, as illustrated in this applet. Presented in the tutorial is a straight wire with a current flowing through it.Download