Problem Set 6 Current x C Advanced Physics questi x C www.webassign.net/web/Stud

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Problem Set 6 Current x C Advanced Physics questi x C www.webassign.net/web/Student/Assignment-Responses last? dep 15855048 Need Help? L Read It Watch It 5. -12 points KatzPSEf1 28.P047. My Notes Ask Your Teacher A 80.0-cm length of a cylindrical silver wire with a radius of 0.195 mm is extended horizontally between two leads. The potential at the left end of the wire is 3.05 V, and the potential at the right end is zero. The resistivity of silver is 1.586 x 10-8 n. m. (a) W hat are the magnitude and direction of the electric field in the wire V/m magnitude direction Select (b) What is the resistance of the wire? (c) What are the magnitude and direction of the current in the wire? magnitude direction Select (d) What is the current density in the wire? A/m Need Help? Read it 6. points KatzPSEf1 28, P.056 My Notes Ask Your Teache According to information on the back of Avi's phone, it draws a current of 2.5 A. Assume it uses a lithium-ion battery that has a terminal potential of 3.7 (a) What is the phone's power requirement? 7:58 PM Ask rne 228/2017

Explanation / Answer

a) for the electric field

electric field = V/d

electric field = 3.05/(0.80)

electric field = 3.81 V/m

the direction of electric field is to the right

b) for the resistance

Resistance = 1.586 * 10^-8 * 0.80/(pi * (0.195 * 10^-3)^2)

Resistance = 0.106 Ohm

c) current in the wire = V/R

current in the wire = 3.05/(0.106)

current in the wire = 28.8 A

the direction is the right

d)

curent density = I/Area

curent density = 28.8/(pi * (0.195 *10^-3)^2)

curent density = 2.411 *10^8 A/m^2

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