Magnetic Poles and Fields
Chinese sailors are thought to be the first to employ this technology
Magnetic compasses
An iron rod becomes magnetic when this occurs
The net spins of many of its electrons are aligned.
As the number of loops in a current-carrying wire is increased, the stronger this becomes
Enclosed magnetic fields
If a compass is moved from the Northern Hemisphere to the Southern Hemisphere, its magnetic needle will change direction this much
very little
Over geologic history the Earth's magnetic field has done this many times
reversed its direction
Unlike magnetic poles do this
attract
The end of a compass needle that points to the south pole of a magnet is this
north pole
When current reverses direction in a wire, the surrounding magnetic field does this
also reverses direction
Disturbances in the Earth's magnetic field traps charges particles creates fountains of high-speed charged particles during this phenomena.
Aurora borealis
This force field can increase a moving electron's speed
electric field
Whereas electric charges can be isolated, magnetic poles..
cannot
Magnetic domains normally occur in this metal
Iron
A beam of electrons can pass through a magnetic field without being deflected if the direction of the beam is this
parallel to the field lines
The force exerted on an electron moving in a magnetic field is maximum when the electron moves this direction
perpendicular to the magnetic field
A galvanometer indicates this
a flow of electrons
The conventional direction of magnetic field lines outside a magnet are from here
North and South
Wood does not have magnetic properties because it contains none of these
magnetic domains
Into this stable force field a proton be placed at rest without being acted upon by a force
magnetic field
Although a magnet can change the direction of travel of an electron beam, it cannot change these two things
Speed and Kinetic energy
A superconducting magnet uses
superconducting coils
The force that acts between a pair of electrically-charged particles depends on these two factors.
magnitude of charge and separation distance
The shape of a magnetic field surrounding a current-carrying conductor is this.
circular
Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is
exactly 100 N
This force field can increase a moving electron's speed
electric field
The force on an electron moving in a magnetic field will be least when its direction is the same as this
the magnetic field direction