Examlex
Which of the following medieval cities are estimated to have had populations of over 50,000 people?
Unlike Charges
Opposite electric charges (positive and negative), which attract each other according to Coulomb's law.
Attraction
The force that causes one object to pull another object to itself.
Repulsion
The force that causes one object to push another object away from itself.
Smallest Part
The component or piece within a system or mechanism that is the least in size, volume, or quantity.
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