Mid-session exam 1 answer key

10 a parallel plate capacitor must store at least 70

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------------------------------------------------------------------------------------------------------------------------------- 10) A parallel-plate capacitor must store at least 7.0 x 10 -5 C at a potential of 12000 V. If the area of each plate is 5.0 x 10 -5 m 2 and separation between the plates is 0.15 mm, can barium titanate with a dielectric constant of 2100 be used for the application a) No b) Can’t say c) Yes Answer: c ------------------------------------------------------------------------------------------------------------------------------- Information: 1) Variation of semiconductor conductivity with temperature: 𝜎 = 𝜎 0 𝑒 −𝐸 𝑔 2𝑘𝑇 where T is in Kelvin a. T(K) = T( o C) + 273 b. Boltzmann constant: k = 8.617 x 10 -5 eV/K c. E g : band gap in eV 2) Magnitude of charge of an electron: |e| = 1.60 x 10 -19 C 3) Avogadro number: N A = 6.02 x 10 23 atoms/mol 4) Capacitance: 𝐶 = 𝜀 𝐴 𝑙 5) Dielectric constant: 𝜀 𝑟 = 𝜀/𝜀 0 a. ε 0 = 8.854 x 10 -12 F/m 6) Resistivity: 𝜌 = 𝑅𝐴 𝑙 7) Power: P = I 2 x R
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  • Spring '14
  • Berry,Vikas
  • 1 m, Electrical conductivity, 0.30 mm, 0.20 cm, carriers/m-3

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