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

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