Just a reminder: the fourth problem from yesterday's exercise (see previous post) is extra credit, worth 1/10 of a homework set. Bring it on Wednesday or email it to me.
As super-double-extra-credit, worth an additional 1/10 of a homework set, show that integrating the surface charge density over the whole plate gives you -q. I suggest once you find the density as a function of lateral position on the plate, integrating the area in polar coordinates, over r(dr)(dtheta), where r would be the distance along the plate.
Also, I'll be around my Bevill office until about 1:30 today if you have homework or other questions. Feel free to drop by.
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