Symmetry & Field of an Infinite uniformly charged plane sheet

  • Thread starter Shreya
  • Start date
  • #1
54
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Homework Statement:
Think of a symmetry now which will tell you that the magnitude of the electric
field is a constant, independent of the x-coordinate for a infinite uniformly charged plane sheet?
Relevant Equations:
Electric Field of uniformly charged infinite planar sheet = (surface charge density)/ (2× permittivity of free space)
Will translation parallel to x axis work ?
Else please suggest the symmetry?
And does symmetry here refer to the symmetry of the sheet which causes the symmetry of the field or something else?
Please be kind to help.
 

Answers and Replies

  • #2
hutchphd
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Think about being on an infinite plane. I look around and everywhere I look is identical. Anywhere I go on the plane there is no preferred direction parallel to the plane. Therefore the field cannot point in any particular parallel direction anywhere so it must point only directly out of the plane everywhere (or be zero). Have you learned Gauss's Law?
 
  • #3
54
21
Thank you, So here, symmetry means being it (sheet and its field) the same irrespective of position.
But, I am still confused about the field being independent of x coordinate.
This is the whole question. Can you please explain on which symmetry shows field in independent of x coordinate.
20210506_081531.png

Think about being on an infinite plane. I look around and everywhere I look is identical. Anywhere I go on the plane there is no preferred direction parallel to the plane. Therefore the field cannot point in any particular parallel direction anywhere so it must point only directly out of the plane everywhere (or be zero). Have you learned Gauss's Law?

Yes, I have learned gauss law and have learnt to derive the field of an infinite plane sheet. This is the image corresponding to the question.
Please be kind to help
Screenshot_20210506-082106_Drive.png
 

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