Are current generators in power plants a source of electrical charges?

Are current generators in power plants a source of electrical charges? How does an electric field arise in a conductor connected to a generator?

Current generators are sources of electrical charges. When the generator is started, an electric current is generated. Under the action of an external field, the electrons begin to mix. The charges of the conductor themselves create their own field, which is opposite in direction to the lines of intensity of the external field and compensates for it. According to the principle of superposition of fields, their strengths are added, and the resulting field strength inside the conductor turns out to be zero.

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