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Unformatted text preview: Physics 2B Spring 2010: Quiz 1 Version A 1 04.9.10 Closed book. No work needs to be shown for multiple-choice questions. 1. The electric field is given by E=E .(y/b) 2 in the z direction. Find the magnitude of the flux through a square of side a in the xy plane. (Hint: the precise location of the square in xy plane is not important. For simplicity, however, it is a good idea to put one of the corners in the origin.) a. E . b. E .(a/b). c. E .(a 2 /3). d. E .a 4 /(3b 2 ). e. E .a 4 /(9b 2 ). 2. A charge of 20 10 6 C is at a position (x=12m,y=0) and a charge of -10 10 6 C is at a position (x=12m,y=5m). What is the magnitude of the force at a charge of -4 10 6 C at the origin? a. 40.56 10-9 N. b. 40.56 10-3 N. c. 3.12 10-6 N. d. 40.56 10-3 N. e. 3.12 10-3 N. 3. Charges of 12.0 C and 18.0 C are placed at two corners of an equilateral triangle with sides of 0.10 m. At the third corner, what is the magnitude of the electric field created by these sides of 0....
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- Spring '10