|
For the case of [electrical current]? moving through a wire, the resulting force is directed acording to the "right hand rule". If the thumb of the right hand points along the wire from positive towards the negative side, the magnetic forces will wrap around the wire in the direction indicated by the fingers of the right hand. If a loop is formed, such that the charged particles are traveling in a circle then all of the forces in the center of the loop are directed in the same direction. The result is called a magenetic dipole. When placed in a magnetic field, a magnetic dipole will tend to align itself with that field. For the case of a loop, if the fingers of the right hand are directed in the direction of current flow, the thumb will point in the direction corresponding to the North pole of the dipole. In the earth's magnetic field the North pole of the dipole will tend to point north. |
|
For the case of electric current moving through a wire, the resulting force is directed acording to the "right hand rule". If the thumb of the right hand points along the wire from positive towards the negative side, the magnetic forces will wrap around the wire in the direction indicated by the fingers of the right hand. If a loop is formed, such that the charged particles are traveling in a circle then all of the forces in the center of the loop are directed in the same direction. The result is called a magenetic dipole. When placed in a magnetic field, a magnetic dipole will tend to align itself with that field. For the case of a loop, if the fingers of the right hand are directed in the direction of current flow, the thumb will point in the direction corresponding to the North pole of the dipole. In the earth's magnetic field the North pole of the dipole will tend to point north. |
|
Magnetic dipoles or magnetic moments can often result on the atomic scale due to the movements of electrons. Each electron has magnetic moments that originate from two sources. The first is the orbital motion of the electron around the nucleus. In a sense this motion can be considered as a current loop, resulting in a magnetic moment along its axis of rotation. The second source of electronic magnetic moment is due to a Quantum Mechanical property called "spin", this property is in some ways analogous to the picture of an electron spinning about an axis and is related to the electron's angular momentum. However, it should be remembered that the Quantum Mechanical "spin" is actually a unique phenomenon from spinning in a macroscopic sense, so the analogy doesn't always hold. The spin magnetic moments may be in one of two directions, either the "up" direction or the "down" direction. |
|
Magnetic dipoles or magnetic moments can often result on the atomic scale due to the movements of electrons. Each electron has magnetic moments that originate from two sources. The first is the orbital motion of the electron around the nucleus. In a sense this motion can be considered as a current loop, resulting in a magnetic moment along its axis of rotation. The second source of electronic magnetic moment is due to a Quantum Mechanical property called "spin", this property is in some ways analogous to the picture of an electron spinning about an axis and is related to the electron's angular momentum. However, it should be remembered that the Quantum Mechanical "spin" is actually a unique phenomenon from spinning in a macroscopic sense, so the analogy doesn't always hold. The spin magnetic moments may be in one of two directions, either the "up" direction or the "down" direction. |
![[Home]](wikipedia.png)