Electric Charges and Fields

Additivity: total charge is the algebraic sum of individual charges.
Conservation: charge may move between bodies, but the total charge of an isolated system remains constant.
Quantisation: observable free charge occurs in integral multiples of the elementary charge.
Invariance: charge does not change merely because the observer or charged particle is moving.

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What is the SI unit of electric charge?

Is electric charge a scalar or a vector quantity?

How do two like electric charges interact?

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