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SAMPLEFinalExamSolutions

SAMPLEFinalExamSolutions - ID A UCSD Physics 2B Answer...

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ID: A 1 UCSD Physics 2B Summer Session SAMPLE Final Exam Answer Section MULTIPLE CHOICE 1. ANS: C F = k q 1 q 2 r 2 = 9.0 × 10 9 Nm 2 / C 2 Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ 45.0 × 10 9 C Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ 63.0 × 10 9 C Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ 25.0 × 10 3 m Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ 2 = 4.08 × 10 2 N PTS: 1 2. ANS: E # e = 410 × 10 9 C Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ 1 e + 1.60 × 10 19 C Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ = 2.56 × 10 + 12 PTS: 1 3. ANS: B By definition E = F q = 1200 N 23 × 10 3 C = 5.2 × 10 4 N C PTS: 1 4. ANS: A The absolute potential at distance r from a point charge q is V = k q r which varies inversely (not inverse square) with distance PTS: 1 5. ANS: A Capacitors in parallel add C PAR = C 1 + C 2 + ë PTS: 1 6. ANS: B Resistors in parallel obey the formula 1 R PAR = 1 R 1 + 1 R 2 + ë and, when all N resistors have the same value, R PAR = 1 N R PTS: 1

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