Needs a solution for each questions Question 6 Calculate the

Needs a solution for each questions

Question 6- Calculate the drift velocity of an electron in a conductor is? The conductor (copper) number of free charges per unit volume is n 8.46 x 1028 q/m3 and the current density J- 382 A/cm2 A) 0.34 m/s B) 5 m/s C) 0.0043 m/s D) 0.00028 m/s Question 7. In question 6 whay is the drift velocity so small compared to the Fermi speed of copper? The fermi energy of copper is given by eermi-7 eV and Fermi speed is vermi-1.57 x 106m/s at 20° C.+\' A) because its cold so it slows down B) because Fermi assumed electrons are waves» C) because electrons collide almost 108 times per meter D) because of the Coulum forces Question8 Determine the potentialdifference of the electric field E-(45 )1+ (16)j-(10Dam Determine the potentialdifference ofthe electric field E=(45\') + (16 -(10-Mom away from portion of the yz plane. Remember Va-Yb-(Ed. Nm Nm a)-95 b)-20 C) 90 Question 9. Calculate the radius of equipotential for a point charge of 10nC where the potential is equal to 3Volts. A)9.9cm 29.9 C)3m D)5m E) none of the above.

Solution

(6) Given n = 8.46 x10 ²⁸ C/ m ³

Current density j = 382 A/ cm ²

                                 = 382 A/(10 ^-4 m ²)

                         = 382 x10 ⁴ A/ m²

We know j = nqv

From this drift velocity v = j/(nq)

Where q = charge of electron = 1.6 x10 ^-19 C

Substitute values you get v = (382x10 ⁴)/(8.46 x10 ²⁸)(1.6 x10 ^-19)

                                         = 2.822 x10 ^-4 m/s

                                          = 0.00028 m/s

(7).because electrons Collide almost 10 ⁸ times per meter

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