magnetism Flashcards
What is a permeble material?
A material that has the ability to concentrate lines of force
What material has the lowest permeability?
Aluminum
What are 3 characteristics of the direction of magnetic flux lines?
- Have direction from north to south
- Take the shortest path
- Repel one another when they have the same direction
How can a permanent magnet lose strength?
When it is stuck with a hammer or exposed to shock, exposed to heat or an alternating magnetic field
An electromagnet device that draws an iron core to its centre is called a?
Solenoid
The right hand rule for conductors determines the?
The direction of the magnetic flux lines around the conductor.
What happens when the current flowing in a coil wire is stopped?
The surrounding magnetic field collapses
What is the name for the process of eliminating current flow through a coil of wire?
Self - induction
Mutual induction occurs between?
2 coils or conductors
The strength of an electromagnet is produced by 3 things. What are they
number of turns of wire within the coil
voltage applied to the coil
type of core material
Magnetic lines of flux cannot be
insulated
When current flows through conductors in the same direction they____________ each other
attract
Magnetism is the invisible force surrounding a
permanent magnet, a current carring conductor or an electromagnet
The magnetic field around a magnet is made up of
many lines of force called FLUX LINES
A voltage is induced in any conductor exposed to a
changing magnetic field
