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CLIP 287

The 3D magnetic field of a bar magnet

The 3D magnetic field of a bar magnet
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Key Info
  • The 3D magnetic field of a bar magnet
  • Duration: 01:51
  • Iron filings are used to demonstrate the shape of the lines of force and the 3D magnetic field around a bar magnet. Magnetic fields are invisible. The presenter demonstrates how iron filings can be used to see the 3D shape of a magnetic field. This works in a liquid as well as in the air. The closer the iron filings the stronger the magnetic field. The presenter then demonstrates an electromagnet, in which a magnetic field is created when current flows in a coil of wire.
  • Subject:

    Science

       Topic:

    Phys: Forces - Magnets and Electromagnets

  • Keywords: magnetism, forces, 3D, three dimensional, line of force, magnetic field, electromagnetism, magnetic induction, current
Ideas for use in class
  • Effective and interesting demonstration of 3D fields.
Background details
  • Clip language : English
  • Aspect ratio : 4x3

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