2005 answers Elec

Copyright 2005 by college entrance examination board

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Unformatted text preview: t may be lost. Copyright © 2005 by College Entrance Examination Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for AP students and parents). 2 AP® PHYSICS C ELECTRICITY & MAGNETISM 2005 SCORING GUIDELINES Question 1 15 points total Distribution of points (a) (i) 2 points For indicating that the electric field magnitude is greatest at point C For a correct justification For example: Field lines are drawn closer together where the field is greater. Note: No credit was awarded for the justification if an incorrect point was chosen. (ii) 1 point 1 point 2 points For indicating that the electric potential is greatest at point A For a correct justification For example: The field along y = 0.6 m is toward the right. The field points in the direction of decreasing potential, so A must be at the highest potential. Note: No credit was awarded for the justification if an incorrect point was chosen. 1 point 1 point (b) (i) 4 points For indicating that the electron moves to the left, stated explicitly or implied For indicating that the speed increases For indicating that the acceleration is directed to the left, stated explicitly or implied For indicating that the magnitude of the acceleration decreases Example of a good answer: The force on an electron is opposite to the field, so it will m...
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