Electric Pressure on a Charged Surface due to External EF

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Discussion Overview

The discussion revolves around the concept of electric pressure on a charged surface in the presence of an external electric field (EF). Participants explore the implications of parallel and normal components of the electric field on the resulting forces and pressures on the surface, touching on concepts of shear force and surface tension.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions why the parallel component of the electric field was not considered, suggesting it could produce electric pressure on the surface.
  • Another participant argues that the parallel component results in a shearing force, which does not contribute to net pressure, as it is orthogonal to the direction needed for movement.
  • A subsequent participant challenges the assertion that shear force does not exert pressure, indicating that shear force is related to surface tension, while pressure arises from forces normal to the area.

Areas of Agreement / Disagreement

Participants express differing views on the role of shear force and parallel components of the electric field, indicating that multiple competing perspectives remain without consensus.

gracy
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Why he did not consider parallel force?Will parallel component of electric field not produce electric pressure on the surface?
 
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The parallel component can only produce/result in a shearing force ; zero net pressure. Or put another way, it is orthogonal to the direction necessary to produce movement.
 
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You mean shear force does not exert pressure?
 
gracy said:
You mean shear force does not exert pressure?
Shear force will be responsible for surface tension, as he said in the video. Pressure will be due to the force normal to the area.
 

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