Преподаю физику по американскому учебнику для колледжа, для НЕ-физиков.
Цитирую:
MAXWELL’S EQUATIONS
- Electric field lines originate on positive charges and terminate on negative charges. The electric field is defined as the force per unit charge on a test charge, and the strength of the force is related to the electric constant ε0ε0 size
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