Spring_2010_Exam_1_Form_B

Spring_2010_Exam_1_Form_B - FORM B PHYS 272 Spring 2010...

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1 PHYS 272 Spring 2010 EXAM-I There are two parts to the Exam: seven multiple-choice problems (70 points) and one comprehensive problem to be hand-graded (30 points). All pages are double-sided. The Answer-Sheet is the last page (both multiple-choice and hand-graded). Tear off the last page to be turned in after you finish. Important: Enter your Name, PUID, Signature on the Answer-Sheet. Show your Purdue ID card to the Instructor when turning in the Answer-Sheet.
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FORM B 2 Problem 1 [10 points] The electric field in static equilibrium at any location inside a hollow, uniformly charged sphere due to the charge on the surface of the sphere is zero. True or false? A. True, because the electric field cannot penetrate the material of the sphere. B. False, because the electric field due to the surface charges penetrates the sphere. C. True, because the contributions of all the charges on the surface add up to zero at every location inside the sphere. D. False, because the electric field is zero only at the center of the sphere, where all the contributions cancel. Problem 2 [10 points] As shown in the diagram, three large, thin, uniformly charged plates are arranged so that there are two adjacent regions of uniform electric field. The origin is at the center of the central plate and the x-axis points to the right. Location A is 0.03,0,0 m, and location B is 0.02,0,0 m. In region 1 the electric field is 1 E = 500 ,0,0 V/m. In region 2 the
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Spring_2010_Exam_1_Form_B - FORM B PHYS 272 Spring 2010...

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