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# act02 - Do NOT write on these sheets or take them with you...

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The next class needs them too! PHYS-1200 PHYSICS II SPRING 2005 Class 2 Activity: Flux and Gauss' Law 1. Area Vectors Sketch the figure below on your paper. On the figure that you drew, draw an area vector A for the flat side of the object facing you. On the figure, draw two different area vectors A d on the curved side of the object. 2. Flux through an open surface . An open surface is a 2-dimentional area that does not enclose any volume, like the area enclosed by a ring. As shown in the figure, a ring has an area vector defined in the direction shown. There is a light source on the right and the ring casts a shadow on a wall on the left. What are the angles between the area vector and the direction of the light when there is maximum light coming through the ring? θ = _____________º How about when there is no light coming through? = _____________º Electric flux, Φ E , is proportional to the number of electric field lines passing through a surface. For an open surface, like a sheet of paper or the area enclosed by a ring or a doorway, the flux through that surface is positive for a field line that has a component parallel to the area vector of that surface. 1

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act02 - Do NOT write on these sheets or take them with you...

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