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Unformatted text preview: Mid-Term Exam: Graduate Electromagnetics I, 95.657 Fall 2011, UMass Lowell, Dr. Baird This in-class examination lasts 60 minutes. No talking, calculators, electronic devices, books or notes allowed except for one page of notes which is one side of a 8 x 11 in. sheet of paper. PART I: Multiple Choice (30 points). Circle the one best answer to each question. 1. A thin ring of radius a carries a uniform positive electric charge density. The ring is fixed in the x- y plane and centered at the origin. A small, permanently negatively charged sphere is placed on the z axis a distance h away from the ring. In what direction does the sphere experience an electrostatic force? (a) positive z direction (b) negative z direction (c) positive x direction (d) ( z cos + r sin ) direction 2. In order to find just the Green function G , what part of the original problem do we need to use? (a) the charge distribution (b) the electrostatic potential on the boundary surface (c) the geometry of the boundary surface only (d) none of the above 3. When would the final solution to the electrostatic potential outside a spherical shell held at a fixed 3....
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- Fall '11