Exercise 25.4 MasteringPhysics An 18-gauge copper wire (diameter 1.02 mm) carrie

Question

Exercise 25.4 MasteringPhysics An 18-gauge copper wire (diameter 1.02 mm) carries a current with a current density of 3.90 × 106 A/m2. The density of free electrons for copper is 8.5 × 102 electrons per cubic meter. Part A Calculate the current in the wire. Express your answer with the appropriate units. 1= 1 Value Units Submit Request Answer Part B Calculate the magnitude of the drift velocity of electrons in the wire. Express your answer with the appropriate units. Ud= 1 Value Units Submit Request Answer

Explanation / Answer

(A) I = J A

I = (3.90 x 10^6 A/m^2 ) ( pi (1.02 x 10^-3 / 2)^2)

I = 3.19 A ....Ans

(B) Vd = J / n q

Vd = (3.90 x 10^6) / (1.6 x 10^-19 x 8.5 x 10^28)

Vd = 2.87 x 10^-4 m/s

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