Name: ______Date: ______Period: ______

Chapter 21 --- Magnetism

SPS10. Students will investigate the properties of electricity and magnetism.

c. Investigate applications of magnetism and/or its relationship to the movement of electrical change as it relates to

Electromagnets

Simple motors

Permanent magnets

  1. Magnetic forces
  2. ______is the force a magnet exerts on another magnet, on iron or a similar metal, or on moving charges.
  3. Magnetic force is one aspect of electromagnetic force
  4. Magnetic (like electric forces) act over a distance and is ______at a ______distance.
  5. ______are the regions where the magnet’s force is strongest, one is the north pole and one is the south pole.
  6. ______ magnetic poles ______one another, and ______magnetic poles ______one another
  1. Magnetic Fields
  2. ______surrounds a magnet and can exert magnetic forces.
  3. A magnetic field, which is strongest near the poles, will either attract or repel another magnet that enters the field.
  4. The field near ______near the ______pole and end at the south pole.
  5. Magnetic Fields around Magnetics
  6. Using iron filings will help see how magnetic fields interact.
  7. Magnetic field surrounds every magnet, the 1st picture shows how they start and end at the poles
  8. 2nd picture shows how two similar magnets ______each other, notice the field lines ______from each other.
  9. 3rd picture show how two opposite magnet poles ______each other, notice that the field lines ______.
  • Magnetic Field Around Earth
  • Earth is like a giant magnet surround by a magnetic field
  • ______is the area surrounding Earth that is influenced by this field
  • Compass points north because it aligns with earth’s magnetic field
  • Magnetic declination is the angle between the direction to true north and to magnetic north
  1. Magnetic Materials
  2. Electrons move around the nucleus, and the spin of each ______causes it to act like tiny ______
  3. In many materials the electrons is paired with another and the magnetic effects mostly cancel each other
  4. Other materials have one or more ______electron and this unpaired electron produces ______
  5. In few materials the unpaired electrons make a strong magnetic field (______, nickel, cobalt)
  6. ______is a region that has a very large number of atoms with ______magnetic fields
  7. ______can be magnetized because it ______magnetic domains
  8. When a material is magnetized most of its magnetic domains are ______
  1. Non-magnetized Materials
  • A material that is ferromagnetic does not mean it is a magnet
  • If the domains of the material are aligned randomly then the magnetization of the domains is canceled
  1. Magnetized Material
  • You can magnetize a non-magnetized ferromagnetic material by ______it in a ______
  • In some materials the domains say aligned for a long time, these are called______magnets
  • ______or a jarring ______can realign the domains in a permanent magnet
  • If you cut a magnet in ½ it will still have a ______and ______pole
  • A magnet can ______have just a north pole or just a south pole
  1. Electromagnetism
  2. ______electric charges ______one another and like electric chares repel one another
  3. Unlike poles attract one another and ______poles ______one another
  4. ______is the force associated with charged particles, which has two aspects electric force and magnetic force.
  5. Electric force results from ______particles
  6. Magnet force usually results from the ______of ______in an atom
  7. Magnetic Fields around moving charges
  8. ______ electric charges create a ______field
  9. The charges may be vibrating charges that produce electromagnetic waves or may be moving charges in a wire
  10. Magnetic field lines form ______around a straight ______carrying a ______
  11. ______is when you Point thumb of right hand in direction of current, your fingers curve in the direction of the magnetic field
  12. Forces Acting on Moving Charges
  13. Recall electric field exerts a force on an electric charge
  14. The force is either in the same direction as the electric field or in the opposite direction (depending on charge)
  15. A charge moving in a magnetic field will be deflected in a direction perpendicular to both the magnetic field and the velocity of the charge
  16. If a current carrying wire is in a______field the wire will be pushed in a direction ______to both the field and the direction of the current.
  17. Solenoids and Electromagnetic
  18. Hair dryers, telephones, and ______utilize electromagnetic
  19. The strength of an electromagnetic depends on the current in the solenoid, number of______in the coil and the type of ferromagnetic ______
  20. greater ______produces a ______magnetic field
  21. Increases the number of ______while keeping the current the same will ______the field strength
  22. Cores that are easily magnetized make ______electromagnets
  1. Electromagnetic Devices
  2. Electromagnets can ______electrical energy into ______that can do work
  3. Electromagnetic devices such as galvanometers, electric motors, and loudspeakers change electrical energy into mechanical energy.
  4. Galvanometer
  • ______a device that uses a ______to measure small amounts of current.
  • When there is a current in the solenoid
  • coils the magnetic field attempts to align with the field of the permanent magnets
  • A ______is an example of a galvanometer
  • Electric Motors
  • ______is a device that uses and electromagnet to turn an ______
  • A battery supplies current to a loop of wire through the commentator
  • At the commentator turns the direction of current switch back and forth
  • The coil’s magnetic field keeps switching ______and this ______the coil about an ______
  • For each ½ rotation of the wire loop, the current produced by the generator ______direction or alternate
  • Loudspeakers
  • A ______contains a ______places around one pole of a permanent ______
  • The current in the wires entering the loudspeaker changes direction and increases or decreases to reproduce music, voices or other sounds
  • The changes current produces a changes magnetic field in the solenoid coil
  • magnetic ______cause ______that produce sound waves