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Lecture 23a

# Lecture 23a - Chapter 23 Gauss Law The first of Maxwells...

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1 The first of Maxwell’s four equations A new technique for calculating E- fields Chapter 23 Gauss’ Law

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What’s in this box? What’s in this box? + charge ̶ charge
From the field lines in the picture, which of the following statements is most likely to be true about box A? A. There are no charges inside B. The charge inside is + C. The charge inside is ̶ D. The total charge inside is zero. E. None of the above can be true.

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Gauss’ law is a geometric relation between the charge contained within a closed surface and the pattern of electric field on that surface Q inside
Flow Source (+) Sink ( ̶ ) http://web.mit.edu/8.02t/ww w/802TEAL3D/visualizations/v ectorfields/particleSink/particl esink.htm http://web.mit.edu/8.02t/ww w/802TEAL3D/visualizations/v ectorfields/particleSource/par ticlesource.htm

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Proportional to the number of field lines flowing through a surface New concept: Electric Flux
Electric Flux ° For a uniform field flowing through a flat surface: ° = E • A A is a vector whose magnitude is the surface area A and whose

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Lecture 23a - Chapter 23 Gauss Law The first of Maxwells...

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