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e) Following the above relationship how would you classify materials as conductor, isolator, or semiconductor. Explain. f) (5 p) We have the following data; m=0.9x10 0 kg, e=1.6x109 Coulomb, p=1.7x10Okm, n=9x10 (electrons/m). Calculate t.

e) Following the above relationship how would you classify materials as conductor, isolator, or semiconductor. Explain. f) (5 p) We have the following data; m=0.9x10 0 kg, e=1.6x109 Coulomb, p=1.7x10Okm, n=9x10 (electrons/m). Calculate t.

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Question 1 a) Ina closed circuit, an electric current of intensity i goes through a resistor of resistance R. The electric potential at the edges of R is measured to be V. If now we write R would this generally bethe definition ofthe resistance quantity R, or the expression of Ohm's Law? Explain. b) We define the resistivity (via the familiar notation) as E p= Thus show that the resistance R can be written as, R =p- here Lis the length ofthe resistor, and A is the cross-sectional area ofit. c) Let J the curent density (i/A). Express J in tems of the electron density n (electrons/m), the electron drift velocity va, and the electron charge e. d) Show that the resistivity can be expressed (via the familiar notation) as, m p= ne't here m is the electronmass; t is the period of time that elapses between two subsequent collisions, the electron undergoes with copper nuclei throughout its chaotic motion in the body of copper (supposing that the current carrying cable is made of copper). Hint: Write F=eE, i.e. the electric force reigning on the electron. Write also the acceleration a=F/m, an electron is subject to, based on the Newton's law ofmotion.
Transcribed Image Text:Question 1 a) Ina closed circuit, an electric current of intensity i goes through a resistor of resistance R. The electric potential at the edges of R is measured to be V. If now we write R would this generally bethe definition ofthe resistance quantity R, or the expression of Ohm's Law? Explain. b) We define the resistivity (via the familiar notation) as E p= Thus show that the resistance R can be written as, R =p- here Lis the length ofthe resistor, and A is the cross-sectional area ofit. c) Let J the curent density (i/A). Express J in tems of the electron density n (electrons/m), the electron drift velocity va, and the electron charge e. d) Show that the resistivity can be expressed (via the familiar notation) as, m p= ne't here m is the electronmass; t is the period of time that elapses between two subsequent collisions, the electron undergoes with copper nuclei throughout its chaotic motion in the body of copper (supposing that the current carrying cable is made of copper). Hint: Write F=eE, i.e. the electric force reigning on the electron. Write also the acceleration a=F/m, an electron is subject to, based on the Newton's law ofmotion.
e) Following the above relationship how would you classify materials as conductor, isolator, or semiconductor. Explain. f) (5 p) We have the following data; m=0.9x1030 kg, e=1.6x1019 Coulomb, p=1.7x10km, n=9x10* (electrons/m'). Calculate t.
Transcribed Image Text:e) Following the above relationship how would you classify materials as conductor, isolator, or semiconductor. Explain. f) (5 p) We have the following data; m=0.9x1030 kg, e=1.6x1019 Coulomb, p=1.7x10km, n=9x10* (electrons/m'). Calculate t.
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