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exam3-F02-ans

# exam3-F02-ans - Physics I Exam 3 Fall 2002 Answer Key Page...

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Physics I – Exam 3 – Fall 2002 Answer Key Page 2 – Part A –Multiple Choice 1. D 2. E 3. A give +2 points for B, knowing E lines perp. to equipot. lines 4. B Page 3 – Part B – B-1 & B-2 B-1 2 R M G g = +4 points, either got it or not (don’t worry about signs) g = 3.69 m/s 2 +2 points, –1 for no units (3.7 is close enough) B-2 0 U K = + +2 points V q U = +2 points or +4 points for other correct approach K = 9000 eV = 1.44 x 10 –15 J +2 points, –1 for no units Page 4 – Part B – B-3 & B-4 B-3 ) sin( B v e F φ = +4 points, either got it or not (don’t worry about signs) can get vertical component of B and use that F = 5.6 x 10 –17 N +2 points, –1 for no units B-4 e F E = or ) sin( B v E φ = +4 points E = 350 N/C or V/m +2 points, –1 for no units This is correct if it is consistent with F from B-3

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Page 5 – Part B – B-5, B-6, & B-7 B-5 d E V = +4 points, either got it or not (don’t worry about signs) V = 17.5 V +2 points, –1 for no units Answer is correct if consistent with E from B-4 B-6 D +4 pts. C +2 pts for knowing it is not in plane of page.
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