What is the relationship between electric potential and the electric field?

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Discussion Overview

The discussion explores the relationship between electric potential and electric field, including their mathematical formulations and implications in various contexts. Participants examine both static and dynamic scenarios involving electric and magnetic fields.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant notes that the electric field is the gradient of the electric potential.
  • Another participant agrees with this point but adds that in the presence of a time-varying magnetic field, the electric field cannot be fully described by the electric potential alone, as it also includes contributions from the time-derivative of the magnetic vector potential.
  • A participant expresses uncertainty about the fundamental relationship between the equations for electric potential and electric field, despite recognizing similarities involving permittivity.

Areas of Agreement / Disagreement

There is some agreement on the relationship between electric potential and electric field as a gradient, but the discussion remains unresolved regarding the implications of time-varying magnetic fields and the completeness of this relationship.

Contextual Notes

The discussion does not resolve the implications of time-varying fields on the relationship between electric potential and electric field, nor does it clarify the assumptions underlying the equations mentioned.

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The electric field is the gradient of the electric potential.
 
Andy Resnick said:
The electric field is the gradient of the electric potential.

However, if there is a time-varying magnetic field present, the electric field is not fully described by the electric potential. In that case, the electric field also has a contribution from the time-derivative of the magnetic vector potential.

Torquil
 

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