Examlex
The only way one can eliminate sampling error is to take the whole population as the sample.
Unidirectional
Moving in only one direction.
Bidirectional
An object that moves in two directions.
Like Charges
Charges that are the same, either both positive or both negative, which repel each other according to Coulomb's law.
Attraction
The force that draws two objects toward each other, such as the electromagnetic force between oppositely charged particles or between magnetic poles.
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