Examlex
When does a study have internal validity? What are its threats? How can they be overcome?
Ampere-Turns
A basic unit for measurement of magnetism. The product of number of turns of wire times current flow.
Electromagnet
A type of magnet in which the magnetic field is produced by an electric current, typically wrapping a wire around a ferromagnetic core, which can be turned on and off with the current.
Proportional
A relationship between two quantities where a change in one results in a corresponding change in the other, often depicted mathematically by a constant ratio.
Compass Needle
A magnetized pointer free to align itself with Earth's magnetic field, used for navigation.
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