1- A 10KQ resistor is made of two strips connected in parallel, each one has40µm thick, and 6mm long, one strip is of intrinsic germanium and has 0.5mmwide. Determine the width of other strip if it made of Ge., doped with 10 21donor atom/cm3 ,at the working temperature. The intrinsic carrier density ofGe is 2.5 x 1019 m3, and the electron and hole mobilities are 0.4 m2 N.sec.and 0.2 m? V.sec. respectively.2- A copper wire of 3mm diameter with conductivity of 6.7 * 107 (Q.m)1, andelectron mobility of 0.0064 m2 N sec. Is subjected to an electric field of 30mV/m.Find (a) the charge density of free electrons,(b) the current density,(c) current flowing in the wire,(d) the electron draft velocity.3- A cylindrical piece of Ge having diameter of 3 mm, is doped with 1015 atom/m of arsenic (As). What length of this Ge would be required to give aresistance of 10KO if the electron mobility in Ge is 0.38 m2 N.sec.

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1- A 10kQ resistor is made of two strips connected in parallel, each one has 40µm thick, and 6mm long, one strip is of intrinsic germanium and has 0.5mm wide. Determine the width of other strip if it made of Ge., doped with 10 21 donor atom/cm ,at the working temperature. The intrinsic carrier density of Ge is 2.5 x 1019 m3, and the electron and hole mobilities are 0.4 m2 .sec. and 0.2 m2 V.sec. respectively.

1- A 10kQ resistor is made of two strips connected in parallel, each one has 40µm thick, and 6mm long, one strip is of intrinsic germanium and has 0.5mm wide. Determine the width of other strip if it made of Ge., doped with 10 21 donor atom/cm ,at the working temperature. The intrinsic carrier density of Ge is 2.5 x 1019 m3, and the electron and hole mobilities are 0.4 m2 .sec. and 0.2 m2 V.sec. respectively.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter1: Atomic Structure

Section: Chapter Questions

Problem 6RQ: How many valence electrons are generally contained in materials used for insulators?

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