Electric Field Lines

  • Thread starter phy
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  • #1
phy
Why are electric field lines always crossing equipotential lines at right angles? Can somebody please explain this to me? Thanks :smile:
 

Answers and Replies

  • #2
Tide
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Since the potential cannot vary along an equipotential surface its gradient can only have a component perpendicular to the surface. The electric field is proportional to the gradient of electrical potential. Therefore, the electric field must be normal to an equipotential surface.
 

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