2005 answers Elec

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Unformatted text preview: ved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for AP students and parents). 6 AP® PHYSICS C ELECTRICITY & MAGNETISM 2005 SCORING GUIDELINES Question 3 15 points total (a) Distribution of points 5 points 1 Position of End Q (cm) 40 Measured Magnetic Field (T) (directed from P to Q) 9.70 ¥ 10 -4 n (turns/m) 250 2 50 7.70 ¥ 10 -4 200 3 60 6.80 ¥ 10 -4 167 4 80 4.90 ¥ 10 -4 125 5 100 4.00 ¥ 10 -4 100 Trial Dividing 100 turns by the length of the spring will yield the number of turns per meter. For each correct value of n Two points were deducted for using more than three significant figures. Some students used B = m0 nI and the theoretical value m0 = 4 p ¥ 10 -7 (T im ) A to solve for n. Since the question did not have any indication of using the data to obtain an experimental value for m0 until part (c), full credit for the question could be earned for this approach. (b) 1 point each 2 points For correctly plotting the data from the chart For a best-fit straight line through the plotted data points, with points both above and below the line 1 point 1 point Copyright © 2005 by College Entrance Examination Board. All rights reserved. Visit...
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