Physics - Magnetism

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1. Electromagnets cannot be made stronger by:

  • Making the coil out of carbon
  • Winding the coil around a core made from iron
  • Increasing the current in the coil
  • Increasing the number of turns of wire around the coil
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2. Which of these elements are magnetic?

  • Magnesium
  • Cobalt
  • Carbon
  • Gallium

3. Steel is an alloy. Why is it magnetic?

  • It is stainless
  • It is mostly made of iron
  • It is mostly made of nickel
  • It is mostly made of zinc

4. The field is __ near the poles of a magnet.

  • Different
  • Weakest
  • Strongest
  • The same

5. A piece of steel can be magnetised by:

  • Coating it in wire
  • Stroking it with a magnet
  • Soaking it in water

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