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Ch12 - CH 12 ELECTRICAL PROPERTIES 1(a Compute the...

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Sheet1 Page 1 CH 12- ELECTRICAL PROPERTIES 1. (a) Compute the electrical conductivity of a 7.0-mm (0.28-in.) diameter cylindrical silicon specimen 57 mm (2.25 in.) long in (b) Compute the resistance over the entire 57 mm (2.25 in.) of the specimen. A) sig = conductivity = 1/ro but ro (resistiv) = VA / Il where A = x-sect area so sig = Il/(V*pi*(d/2)^2) B) ro = RA/l so Resistance = l/(sig*A) = l/(sig*pi*(d/2)^2) Err:510 3. (a) Using the data in Table 12.1, compute the resistance of an aluminum wire 5 mm (0.20 in.) in diameter and 5 m (200 in. A) R = ro*l/A = l/(sig*A) = l/(sig*pi*(d/2)^2) B) I = V/R C) J = I/A = I/(pi*(d/2)^2) D) E = V/l Err:510 4. How does the electron structure of an isolated atom differ from that of a solid material? ------>For an isolated atom, there exist discrete electron energy states (arranged into shells and subshells) Err:510 5. (a) Calculate the drift velocity of electrons in silicon at room temperature and when the magnitude of the electric field is 500 (b) Under these circumstances, how long does it take an electron to traverse a 25-mm (1-in.) length of crystal?

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