2005 answers Elec

2005 answers Elec

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Unformatted text preview: ove left. The field is weaker to the left so the acceleration will decrease. As long as there is a force on the electron, its speed will continue to increase to the left. (ii) 1 point 1 point 1 point 1 point 3 points For using conservation of energy with U = qV 12 mu = q DV 2 u = 2 q DV m For correct substitution of values into either equation above ( u = 2 1.6 ¥ 10 -19 ) ( C (10 V ) 9.11 ¥ 10 -31 kg ) For the correct answer 1 point 1 point 1 point u = 1.9 ¥ 10 m s Note: Substitution point was awarded if correct answer was indicated. 6 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). 3 AP® PHYSICS C ELECTRICITY & MAGNETISM 2005 SCORING GUIDELINES Question 1 (continued) Distribution of points (c) 2 points DV r 20 V E= 0.01 m For the correct answer with correct units E = 2000 V m or 2000 N C For the correct assumption that the field is close enough to uniform in this region to do a calculation as if it were E=- (d) 1 point 1 point 2 points For drawing a curved line concave up or concave right that passes through point D and at least three electric field lines For drawing the curved line perpendicular to at least three field lines 1 point 1 point Copyright © 2005 by College Entrance Examination Board. All...
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This note was uploaded on 08/05/2009 for the course PHYS 101 taught by Professor Reich during the Spring '08 term at Johns Hopkins.

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