Magnetic Fields
What are the two ends of a magnet called?
North & South poles
What is the flow of electric charge called?
Electric current
Who developed the equations that describe electromagnetism?
James Clerk Maxwell
What metal is commonly used to make the core of an electromagnet?
Iron
What happens when like poles of two magnets are brought close together?
They repel
What unit is used to measure electric current?
Ampere (A)
What German scientist formulated the law describing induced voltage in a coil?
Michael Faraday
What happens to an electromagnet when the electric current is turned off?
It loses its magnetism
What shape do magnetic field lines around a bar magnet take?
They form closed loops from the north pole to the south pole
What type of current flows in only one direction, like in a battery-powered circuit?
Direct current (DC)
What scientist’s name is used for the unit of magnetic field strength?
Nikola Tesla
Increasing the number of coils around a core will do what to an electromagnet’s strength?
Increase its strength
What is the area around a magnet where magnetic forces act?
Magnetic field
Who discovered the relationship between electricity and magnetism in 1820?
Hans Christian Ørsted
Who invented the first battery?
Alessandro Volta
What happens when you turn off the electric current in an electromagnet?
The magnetic field disappears