1141 Definitions Flashcards
iron ore with natural magnetic properties
magnetite
metals strongly attracted by magnets
ferromagnetic
iron nickel cobalt
ferromagnetic metals
metals weakly attracted by magets
paramagnetic
aluminum magnesium
paramagnetic metals
strong magnetic alloy of aluminum, nickel, and cobalt
alnico
metals slightly repelled by magnets
diamagnetic
gold silver copper
diamagnetic metals
forces that act at a distance
gravity, static electricity, magnetism, and nuclear forces
wrote the first scientific study of magnetism
William Gilbert
Dip compass
not straight lines. 0 is equator. 90 is pole
Magnetic domains
millions of magnetic atoms aligned in the same way
the space around Earth where magnetic forces can be detected
magnetosphere
a field:
a region in space in which a body’s magnetic, electric, or gravitational force exerts its influence
an electromagnet
a solenoid with an iron core
an electric motor
a device that converts electric current to mechanical energy
the production of electricity by a changing magnetic field and the production of magnetism by a moving electric current
Electromagnetic induction
an electric generator
a device that converts mechanical energy to electric energy
invented the solenoid
Andre Ampere
made improved, stronger electromagnets
Joseph Henry
first demonstrated that electricity can generate a magnetic field
Hans Christian Oersted
used electromagnets in inventing the telegraph
Samuel F. B. Morse
developed magnetic field theory
Michael Faraday
Magnetic flux density (strength of magnetic field)
(number of loops x current in amperes) / (length of the solenoid in meters)
