Question

Electric potential of earth is taken to be zero. Why?

Answer 1

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earth is a good conductor of very large size. when some small charge is given to earth, its potential does not change. hence potential of earth is assumed to be zero. it is like sea level being taken as zero level for measuring all heights.

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Answer 2

Becoz the resistance of the earth is non zero,so the current injected into the earth at the grounding electrode produces a potential rise with respect to a distant reference point.

Hope it help...