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# exam1 - PHYS 411(Fall 2011 Electricity and Magnetism 1st...

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PHYS 411 (Fall 2011): Electricity and Magnetism 1 st Mid-term exam: Friday, October 14, 11.00-11.50 am. Read the instructions below and do not flip to next page till you are told to do so. Name: Student ID: Useful formulae: da = r 2 sin 6 f dd F= T^'~ V(f] P = Xe V.E = £ D = e 0 E + P = s ds dcj) dz D = p, It is necessary to show the details of the derivation and not just the final answer for all problems. This is a closed book exam: crib sheets are not allowed. The problems are roughly in order of increasing difficulty (and points). Please write clearly and if you use the backside of a page, then please indicate so. Check that there are total of 5 pages (4 problems). Remember the honor pledge that you signed at the start of the semester. Problem # 1 2 3 4 Total Points scored Maximum points 7 11 12 20 50

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1. A charge q (> 0) is placed a distance Id along the z-axis above the infinite conducting x y plane which is grounded (i.e., it has potential zero). A 2nd charge is placed on the z-axis at distance d above the conducting plane such that the net force
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exam1 - PHYS 411(Fall 2011 Electricity and Magnetism 1st...

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