Phy102&amp;07-II-ms2

# Phy102&amp;07-II-ms2 - Part I Problems Show working 1 A...

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Unformatted text preview: Part I: Problems Show working. 1. A 315 μ F capacitor has dielectric (dielectric constant of 2.90) filling the 0.275 mm gap between its parallel plates. The charge on each plate has magnitude 0.167 μ C. What is the magnitude of the surface charge density on each plate? a) 17 pC/m 2 b) 49 pC/m 2 c) 94 pC/m 2 d) 140 pC/m 2 (2 points) C = Kǫ A d = ⇒ A = C Kǫ d = 3 . 38 × 10 3 m 2 = ⇒ | Q | A = 4 . 9 × 10 − 11 C/m 2 2. The three capacitors below are all fully charged. The charge on the 1.0 μ F capacitor is 2.0 μ C. What is the emf of the battery? a) 1.7 V b) 2.0 V c) 2.3 V d) 3.7 V (4 points) 1 . μ F 4 . μ F 6 . μ F Δ V 1 . μ F = 2 . μ C 1 . μ F = 2 . 0 V = Δ V 4 . μ F = ⇒ Q 4 . μ F = (4 . μ F)(2 . 0 V) = 8 . μ C = ⇒ Q 6 . μ F = Q 1 . μ F + Q 4 . μ F = 10 . μ F E = Δ V 4 . μ F + Δ V 6 . μ F = 2 . 0 + 10 . μ C 6 . μ F = 3 . 7 V 3. A wire (diameter of 1.95 mm) carries a current of 5.15 A; there are 8 . 5 × 10 28 free electrons per cubic meter. How much time does a free electron take to travel a 1.25 m length of this wire? a) 1 . 4 × 10 3 s b) 5 . 4 × 10 3 s c) 9 . 8 × 10 3 s d) 11 × 10 3 s (2 points) v d = 1 nq I A = 1 . 27 × 10 − 4 m/s = ⇒ Time = Length v d = 9 . 8 × 10 3 s 4. At 20 ◦ C, the cylindrical wire below carries a current of 2.65 A. What is the current atC, the cylindrical wire below carries a current of 2....
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## This note was uploaded on 11/03/2009 for the course PHY 101 taught by Professor Exams during the Spring '07 term at Kuwait University.

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Phy102&amp;07-II-ms2 - Part I Problems Show working 1 A...

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