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If like poles are facing each other, though, they are repulsed from the larger magnetic field. The magnetic pole model predicts a correct mathematical form for this force and is easier to understand qualitatively. For if a magnet is placed in a uniform magnetic field then both poles will feel the same magnetic force but in opposite directions ...
Magnetic field. A permanent magnet, a piece of magnetized metal alloy. A solenoid (electromagnet), a coil of wire with an electric current through it. The shape of the magnetic fields of a permanent magnet and an electromagnet are revealed by the orientation of iron filings sprinkled on pieces of paper.
Magnetic field demonstration with solenoid-shaped insulated wire and iron filings. A solenoid (/ ˈsoʊlənɔɪd / [1]) is a type of electromagnet formed by a helical coil of wire whose length is substantially greater than its diameter, [2] which generates a controlled magnetic field. The coil can produce a uniform magnetic field in a volume of ...
The magnetic field (marked B, indicated by red field lines) around wire carrying an electric current (marked I). Compass and wire apparatus showing Ørsted's experiment (video [ 1 ] ) In electromagnetism , Ørsted's law , also spelled Oersted's law , is the physical law stating that an electric current induces a magnetic field .
The North magnetic pole piece (top) in this drawing is shown further away from the disk than the South; this is just to leave room to show the currents. In an actual eddy current brake the pole pieces are positioned as close to the disk as possible. A magnet induces circular electric currents in a metal sheet moving through its magnetic field ...
The magnetic field of all the turns of wire passes through the center of the coil, creating a strong magnetic field there. [2] A coil forming the shape of a straight tube (a helix) is called a solenoid. [1] [2] The direction of the magnetic field through a coil of wire can be found from a form of the right-hand rule.
Magnetic field (green) induced by a current-carrying wire winding (red) in a magnetic circuit consisting of an iron core C forming a closed loop with two air gaps G in it. In an analogy to an electric circuit, the winding acts analogously to an electric battery, providing the magnetizing field , the core pieces act like wires, and the gaps G act like resistors.
For example, the south pole of the magnet is exactly as strong as the north pole, and free-floating south poles without accompanying north poles (magnetic monopoles) are not allowed. In contrast, this is not true for other fields such as electric fields or gravitational fields , where total electric charge or mass can build up in a volume of space.