A naturally magnetized mineral magnetite, called __________, was used as the first compass. It could turn an iron needle into a magnet, which would always point North. This enabled navigation.
Lodestone
True or false?
Electric charges flow easily through insulators such as rubber, wool, glass, and wood. True or False?
False
Gold, silver, and copper allow electrical charges to move easily. These metals make efficient _______________.
conductors
A lightning strike is an example of the transfer of particles that have an electric charge between objects that are not touching. This transfer is called a ____________________.
static discharge
The strength of electric force becomes weaker as electrically charged objects get closer to each other.. True or False?
False
The strength of electric force becomes stronger as electrically charged objects get closer to each other. True or False?
True
The largest natural magnet on Earth is the planet itself. True or False?
True
As opposed to permanent magnets, electromagnets attract magnetic objects only when the electric current is turned on. True or False?
True
This is an illustration of Earth's magnetic _______________, or the space where the force of a magnet acts.
Field
