TA: Tomoyuki NakayamaThursday, May 27, 2010PHY 2048: Physic 2, Discussion Section 8701 Quiz 2 (Homework Sets #3 & #4) Name: UFID: Formula sheets are not allowed. Calculators are allowed. Do not store equations in your calculator. You need to show all of your work for full credit. ________________________________________________________________________________ In the figure below right, a small circular hole of radius R= 3.00 cm has been cut in the middle of an infinite, flat, nonconducting surface that has uniform charge density σ= 6.00 pC/m2. A z axis, with its origin at the hole’s center, is perpendicular to the surface. We are going to find out the electric field at point Pat z = 5.00 cm in a following way: a) Applying Gauss’s law, find the electric field at point Pdue to the nonconducting surface before the hole was cut. We take our Gaussian surface to be a cylinder which has end caps of area A parallel to the flat surface. Then the electric field is perpendicular to the end caps and parallel to the round surface of the cylinder. Gauss’s law yields ε0E(2A) = σA ⇒E = σ/2ε0 = 0.339 N/C b) If charge q
This is the end of the preview.
access the rest of the document.