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• October 5, 2021

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• PHY102 Physics II © Dr.Cem Özdoğan

• 23-3 Electric Flux

• An electric field vector pierces a small square patch on a flat surface.
• Only the x component actually pierces the patch; the y component skims across it.
• The area vector of the patch is perpendicular to the patch, with a magnitude equal to the patch’s area.

• Electric Flux

• The area vector dA for an area element (patch element) on a surface is a vector that is perpendicular to the element and has a magnitude equal to the area dA of the element.

• The electric flux dϕ through a patch element with area vector dA is given by a dot product:

• what is the source of the E?