domain theory of magnets: all large magnets are made up of many smaller and flexible magnets that can interact with each other.
dipoles: the small and flexible magnets that make up a large magnets.
electromagnet: a coil of wire around a soft iron core, which uses electric current to produce a magnetic field.
ferromagnetic metals: metals such as iron, nickel, cobalt, or mixtures of these three that attract magnets.
magnetic field: distribution of the magnetic force in the region of magnet
magnetic domain: the effect produced when dipoles of a magnet line up
Oersted's Principle: Charge moving through a conductor produces a circular magnetic field around the conductor.
first right-hand rule for conductors:
right-hand rules:
second right hand rule for coils:
3
Test compass: a compass used to check the presence of the magnetic field and to map a magnetic field.
Summary: 17.1 The magnetic Force-Another force at a Distance
- Similar magnetic poles, NORTH and NORTH or SOUTH and SOUTH repel each with a force at a distance.
- Dissimilar magnetic poles , NORTH and SOUTH, attract each with a force at a distance.
- Earth is a huge permanent magnet, producing own magnetic Field.
- Earth's magnetic field is produced by the flow of hot liquid metals inside Earth.
- All magnets are made up of iron, nickel, cobalt or mixture ( ferromagnetic metals)
- Magnetic materials are composed of smaller magnets which is based on domain theory of magnets.
- Scientist developed hand signs to predict how magnetic forces act (right-hand rules)
No comments:
Post a Comment