Physics 5054 · O Level · Simple magnetism and magnetic fields

Simple magnetism and magnetic fields — practice question

Which method will demagnetise a bar magnet?

  • Aplacing the magnet inside a coil connected to a d.c. supply
  • Bplacing the magnet inside a coil connected to an a.c. supply
  • Cwithdrawing the magnet from inside a coil connected to a d.c. supply
  • Dwithdrawing the magnet from inside a coil connected to an a.c. supply

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