Magnets and Magnetic Fields Magnetic Forces Magnetic Forces
- Slides: 8
Magnets and Magnetic Fields Magnetic Forces
Magnetic Forces • Is the force a magnet exerts on another magnet, on iron or a similar metal, or on moving charges. - acts over a distance and varies over a distance as well.
Magnetic Forces • Magnetic Poles: two regions where the magnet’s force is strongest. The one is the North and the other is the South. • The direction of magnetic force between two magnets depends on how the poles face. • Like magnetic poles repel one another, and opposite magnetic poles attract each other.
Magnetic Fields • Magnetic Field: surrounds a magnet and can exert magnetic forces. – A magnetic field, which is strongest near a magnet’s poles, will either attract or repel another magnet that enters the field.
Magnetic Field Around the Earth • Magnetosphere: The area surrounding earth that is influenced by this field. – Geographic North pole is 90 degrees. – Magnetic North pole is 81 degrees North.
Magnetic Materials • Iron, Nickel, and Cobolt have strong magnetic fields. • Magnetic Domains: is a region that has a very large number of atoms with aligned magnetic fields. • Ferromagnetic Material: such as iron, can be magnetized because it contains magnetic domains. • When a material is magnetized, most of its magnetic domains are aligned.
Nonmagnetized Materials • Just because something is ferromagnetic doesn’t mean that it is magnetized. • If the domains of the material are not aligned and they are randomly aligned, the magnetic capabilities are cancelled out.
Magnetized Materials • Some materials can become magnetized by being placed in the magnetic field of another magnetic, but it then loses it magnetic capabilities. This is known as a temporary magnet. • When a material holds it aligned domains for longer periods of time, it is known as a permanent magnet.
- Scrap heap magnet circuit diagram
- Learning: module 26: magnetic forces and fields
- Red fields to green fields
- Explain how currents and magnets exert forces on each other
- Right hand grip rule
- Electric currents and magnetic fields
- Visualizing magnetic field
- Electric forces and fields concept review
- Chapter 16: electric forces and fields answers