Magnets & Materials
A field force of attraction or repulsion between north and south poles.
Magnetism
The space around a magnet where another magnet would feel a force.
A magnetic field
The shape of the field around a long straight current-carrying wire.
Cylindrical
A charge sitting still in a magnetic field feels this magnetic force.
Zero
Sliding a wire across field lines can create this.
An emf
Like poles do this.
Repel
Magnetic field lines are drawn this way.
North to south
Reverse the current and this happens to that field.
It reverses
A charge moving across a magnetic field feels this.
A magnetic force
The induced field always does this to the change that made it.
Opposes it
Magnetism in ordinary matter comes mainly from these.
Spinning electrons
How much field punches through a given area.
Magnetic flux
Many stacked turns of current-carrying wire.
A solenoid
Two side-by-side wires carrying current the same way do this.
Attract
A device that turns mechanical energy into electrical energy.
A generator
Iron, cobalt, and nickel are this kind of material.
Ferromagnetic
Earth’s field comes from motion in this part of the planet.
The iron-nickel core
Slide an iron rod into those turns and you have this.
An electromagnet
Two side-by-side wires carrying current opposite ways do this.
Repel
A device that turns electrical energy into mechanical energy.
A motor
A patch of iron where the atomic magnets all point the same way.
A domain
A compass needle’s north end points toward this magnetic pole.
Magnetic south
Right thumb along the current; fingers curl this.
The magnetic field
A speaker uses a magnet, a coil, and this moving part.
A cone
A split ring that swaps contacts each half-turn in a DC motor.
A commutator