UnitExam2Bsolutions

UnitExam2Bsolutions - ID: B UCSD Physics 2B Answer Section...

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ID: B 1 UCSD Physics 2B Unit Exam 2B Potential & Capacitors Answer Section MULTIPLE CHOICE 1. ANS: B V = E d r a b = 2 k λ r dr a b = 2 k ln b a Ê Ë Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ C = Q V = L 2 k b a Ê Ë Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ = L 2 k b a Ê Ë Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ C = L 2 k b a Ê Ë Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ = 18 m 29 .0 × 10 9 Nm 2 / C 2 Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ 1.0 × 3 m 0.90 × 3 m Ê Ë Á Á Á Á Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ ˜ ˜ ˜ ˜ = 9.49 × 9 F = 9.49 nF TOP: CAP cylinder 2. ANS: C C = ε 0 A d d = 0 A C = 8.85 × 12 C 2 / Nm 2 Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ 4200 m 2 Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ 71 × 6 F Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ = 5.24 × 4 m = 0.524 mm TOP: CAP plate 3. ANS: B The field is uniform between parallel plates, so V ||=− E dL 0 d | | | | | | | | = Ed = 150 × 3 V / m Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ 3.77 × 2 m Ê Ë Á Á Á ˆ ¯ ˜ ˜ ˜ = × 3 V = 5.66 kV TOP: V from E 4. ANS: D We solve this by equating the Energy gain through Work done on the electron by the field W = q Δ V
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This note was uploaded on 08/23/2008 for the course PHYS 2b taught by Professor Schuller during the Summer '08 term at UCSD.

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UnitExam2Bsolutions - ID: B UCSD Physics 2B Answer Section...

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