Chapter 22: Magnetism and Electromagnets Quiz
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Questions and Answers

What was the first significant observation that led to the discovery of electromagnetism?

  • North and south poles of electromagnets
  • Compass needle deflected by a current carrying wire (correct)
  • Permanent bar magnet attracting iron filings
  • Iron filings responding to a current-carrying coil

What term is used for magnets created by the use of electric current?

  • Electromagnets (correct)
  • Superconducting magnets
  • Permanent magnets
  • Ferromagnets

Why are ferromagnets combined with electromagnets for certain applications?

  • To increase the magnetic effect (correct)
  • To decrease the coil resistance
  • To reduce the magnetic field strength
  • To separate the north and south poles

Why are superconducting magnets sometimes preferred over regular electromagnets?

<p>They have no coil resistance (C)</p> Signup and view all the answers

What is a limitation to how strong regular electromagnets can be made?

<p>Coil resistance causing overheating (B)</p> Signup and view all the answers

In what century was it discovered that electrical currents cause magnetic effects?

<p>19th century (D)</p> Signup and view all the answers

What happens when like poles of magnets are brought near each other?

<p>They repel each other (B)</p> Signup and view all the answers

What is destroyed in superconducting magnets if subjected to a magnetic field that is too great?

<p>Superconducting properties (D)</p> Signup and view all the answers

What are the induced magnets created by electric current called?

<p>Electromagnets (C)</p> Signup and view all the answers

What is the name of the Danish scientist who first observed the deflection of a compass needle by a current carrying wire?

<p>Hans Christian Oersted (A)</p> Signup and view all the answers

What are the induced magnets created by electric current called?

<p>Electromagnets (B)</p> Signup and view all the answers

Which term refers to the use of electric current to make magnets?

<p>Electromagnetism (D)</p> Signup and view all the answers

What limits how strong regular electromagnets can be made?

<p>Overheating and melting at high current (A)</p> Signup and view all the answers

What material is used to enhance electromagnets for applications like lifting scrap metal or in particle accelerators?

<p>Superconductors (C)</p> Signup and view all the answers

In what manner do like poles of magnets interact with each other?

<p>Repel (A)</p> Signup and view all the answers

What characteristic do electromagnets and ferromagnets share?

<p>'Permanent' poles that cannot be separated (D)</p> Signup and view all the answers

What happens when a ferromagnet is combined with an electromagnet?

<p>Attraction increases (C)</p> Signup and view all the answers

What could be a reason for employing superconducting magnets over regular electromagnets?

<p>Resistance to overheating at high current (A)</p> Signup and view all the answers

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