Question

Why the electric potential of earth is zero because earth is a good?

Answer 1

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Our earth has its own magnetic field and thus it can be considered as a whole magnet, and we know a good conduct for magnetic field is even a good conductor for electricity. Hence, earth is a conductor. ... For this earth is taken to be zero potential surface.

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Answer 2

Our earth has its own magnetic field and thus it can be considered as a whole magnet, and we know a good conduct for magnetic field is even a good conductor for electricity. Hence, earth is a conductor. ... For this earth is taken to be zero potential surface.