The electric potential at a distance d from a point charge is V.At a distance d',the potential is 2V.What is the ratio of electric field at d' to that at d?

Name: The electric potential at a distance d from a point charge is V.At a distance d',the potential is 2V.What is the ratio of electric field at d' to that at d?
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The Answer of The electric potential at a distance d from a point charge is V.At a distance d',the potential is 2V.What is the ratio of electric field at d' to that at d?

The Electric Potential at a Distance D from a Point