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Magnetic Forces and Fields

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Magnetic Forces and Fields

Explore how magnets interact with materials and each other. Read the mini-investigation, then answer each question. For the field-line sketch, draw lines with arrows to show their direction.

The lost-fastener investigation

At a coastal clean-up, Maia uses a bar magnet to sort a mixed tub of objects. She tests each object without touching it. The iron nail and steel paperclip move towards the magnet. The aluminium drink-can tab and plastic bottle cap do not. When she turns the magnet around, the nail still moves towards it. Later, she brings two bar magnets close together: north facing north pushes away, while north facing south pulls together. Small iron filings gather most densely near the two ends of a bar magnet.

Make sense of the evidence

Use the investigation and what you know about magnetic fields to solve the questions.

1.Which two objects in Maia’s tub were attracted to the magnet?
  • The iron nail and steel paperclip
  • The aluminium tab and plastic cap
  • The iron nail and aluminium tab
  • All four objects
2.True or false? Every metal object is attracted to an ordinary magnet.
TrueFalse
3.A north pole is brought close to another north pole. What will the magnets do?
  • Attract
  • Repel
  • Melt
  • Have no magnetic force
4.A north pole is brought close to a south pole. What will happen?
5.Why did turning the magnet around not stop the iron nail being attracted?
6.The iron filings gathered most densely near the magnet’s ends. What does this tell you about the magnetic field there?
7.Why could the magnet pick up the steel paperclip but not the aluminium drink-can tab, even though both are metals?
8.A compass needle turns when brought near a bar magnet. Explain how the compass can respond even without touching the magnet.
9.As you move farther from a magnet, how does its magnetic field generally change?
  • It becomes weaker
  • It becomes stronger
  • It stays exactly the same
  • It changes into light
10.Draw a bar magnet and add several curved field lines around it. Label the north and south poles, and add arrows to show the field direction outside the magnet.

2 printable pages

  • Magnetic Forces and Fields, page 1 of 2: The lost-fastener investigation, Make sense of the evidence

    Page 1

  • Magnetic Forces and Fields, page 2 of 2: 5. Why did turning the magnet around not stop the iron nail being attracted?

    Page 2

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