Magnetism

• when the when the wire is closer to the magnet, the current is larger
• an ideal core for an induced magnet is iron
• how could you show that paper clips are induced magnets

  by taking them off the magnet, and seeing if they fall apart
• how could you show the earth has a magnetic field

  the needle of a magnet will always point north if the earth has a magnetic field
• you have

  • a power pack
  • a long wire
  • a stiff card
  • iron filings

  how could you use this equipment to show the shape of a magnetic field produced by the current in the wire?

  
  

  a.Put the wire though the card and put iron filings around the wire

  b. Connect the power pack to the wire and see the pattern made by the iron filings

  c. Put the iron filings though the card and put the power pack around the wired.

  d. Connect the power pack to the iron filings and see the pattern made by the card
• what do the magnetic field lines on a uniform magnetic field look like?

  straight lines between the magnets
• what measurements do you need to calculate specific heat capacity?

  Mass

  initial temperature

  final temperature

  amount of heat added or removed.