Podcast
Questions and Answers
What was the first significant observation that led to the discovery of electromagnetism?
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?
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?
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?
Why are superconducting magnets sometimes preferred over regular electromagnets?
What is a limitation to how strong regular electromagnets can be made?
What is a limitation to how strong regular electromagnets can be made?
In what century was it discovered that electrical currents cause magnetic effects?
In what century was it discovered that electrical currents cause magnetic effects?
What happens when like poles of magnets are brought near each other?
What happens when like poles of magnets are brought near each other?
What is destroyed in superconducting magnets if subjected to a magnetic field that is too great?
What is destroyed in superconducting magnets if subjected to a magnetic field that is too great?
What are the induced magnets created by electric current called?
What are the induced magnets created by electric current called?
What is the name of the Danish scientist who first observed the deflection of a compass needle by a current carrying wire?
What is the name of the Danish scientist who first observed the deflection of a compass needle by a current carrying wire?
What are the induced magnets created by electric current called?
What are the induced magnets created by electric current called?
Which term refers to the use of electric current to make magnets?
Which term refers to the use of electric current to make magnets?
What limits how strong regular electromagnets can be made?
What limits how strong regular electromagnets can be made?
What material is used to enhance electromagnets for applications like lifting scrap metal or in particle accelerators?
What material is used to enhance electromagnets for applications like lifting scrap metal or in particle accelerators?
In what manner do like poles of magnets interact with each other?
In what manner do like poles of magnets interact with each other?
What characteristic do electromagnets and ferromagnets share?
What characteristic do electromagnets and ferromagnets share?
What happens when a ferromagnet is combined with an electromagnet?
What happens when a ferromagnet is combined with an electromagnet?
What could be a reason for employing superconducting magnets over regular electromagnets?
What could be a reason for employing superconducting magnets over regular electromagnets?