In a metal such as copper, where each atom contributes approximately one conduction electron,…

In a metal such as copper, where each atom contributes approximately one conduction electron, typical current densities are the result of electrons moving at a surprisingly low velocity. To estimate this velocity, assume that each atom contributes one conduction electron and that the material is copper, where the molecular weight 0571e3f1 5d92 4da5 afe4 f8acfe9914b2 0d6ae59a f7e4 4cd6 936d e36e43c002ca 63.5 and the mass density is e3d5c190 3384 4d68 b564 f1e4df7b84dekg/m3 . Thus, the density of electrons is approximately 6b2fc9e5 24fb 4242 bff3 7965ad58d38e, where 9b80e4bd 39d6 4d8e aaac 6c3ee35e44df ba494584 5485 43cc 8f10 e1d5b6134c5b molecules/kg-mole is Avogadro’s number. Given σ from Table 7.1.1, what is the mobility of the electrons in copper? What electric field intensity is required to drive a current density of l amp/cm2? What is the electron velocity?

Table 7.1.1

09b62164 ac40 4a33 b1fc 44ea4168372f

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