Electric field and potential: If the electrical potential in a region is constant, the electric field must be zero everywhere in that region.

Name: Electric field and potential: If the electrical potential in a region is constant, the electric field must be zero everywhere in that region.
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Quizplus · Accepted Answer

This is because the electric field is defined as the negative gradient of electrical potential, meaning that if there is no change in potential, then the gradient and thus the field is zero.

Electric Field and Potential: If the Electrical Potential in a Region