fa09final

# fa09final - Final Exam Physics 2102 Fall 2009 December 8th,...

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Page 2 of 16 1) (20 pts) Two point charges, of 5.00 nC and -7.00 nC, respectively, are fixed in place on an xy coordinate plane as shown in the figure. At a point on the plane, P , no charge exists, but there is an electric field due to the presence of the two point charges. a) (7 pts) Calculate the electric potential at point P , taking the potential at an infinite distance to be zero. b) (3 pts) At point P on the figure, sketch (and clearly label) three vectors: the electric field contribution due to the +5.00 nC charge the electric field contribution due to the -7.00 nC charge the net electric field c) (10 pts) Calculate the electric field vector at P in unit vector notation.
Page 3 of 16 2) (16 pts) Consider the following graphs which plot the magnitude of the electric field as a function of r , the distance from the center of a solid sphere of radius R . | i) (4 pts) Which graph represents E ( r ) for a conducting sphere with an excess charge of + Q on it? A B C D E ii) (4 pts) Which graph represents E(r) for an insulating sphere containing a uniform distribution of positive charge? A B C D E

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Page 4 of 16 (Question 2, cont) Circle the Maxwell equation most directly associated with the following statements. iii) An alternating emf is induced in a coil that rotates in a uniform magnetic field. a) Gauss ʼ Law. b) Gauss ʼ Law for magnetic fields (no magnetic monopoles). c)
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## This note was uploaded on 05/20/2011 for the course PHYS 2102 taught by Professor Gimmnaco during the Fall '08 term at LSU.

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fa09final - Final Exam Physics 2102 Fall 2009 December 8th,...

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