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Physics · May / June 2017 · Paper 12 · Question 31

5054Simple magnetism and magnetic fields

Which action demagnetises a bar magnet?

  1. Aplacing the magnet inside a coil connected to a d.c. supply
  2. Bplacing the magnet inside a coil connected to an a.c. supply
  3. Cwithdrawing the magnet from inside a coil connected to a d.c. supply
  4. Dwithdrawing the magnet from inside a coil connected to an a.c. supply

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Correct answer: D. withdrawing the magnet from inside a coil connected to an a.c. supply

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