Gauss Law general physics 2 question

Thread starter DavidGarcia
Start date Mar 18, 2021
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Gauss Gauss law General General physics Law Physics Physics 2

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The discussion centers on a question related to Gauss's Law in a General Physics II context. Participants emphasize the importance of demonstrating personal effort in problem-solving before seeking help. The guidelines encourage students to attempt the problem independently to facilitate better assistance. There is a focus on understanding the application of Gauss's Law in various scenarios. Overall, the conversation highlights the balance between seeking help and personal engagement in learning physics.

Mar 18, 2021

DavidGarcia

Homework Statement: A very long aluminum wire has a radius of 1 cm and an uniform charge density of 6 x 10^-5 C/m^2 over its area. 1.) what is the charge on 1 m of this wire? 2.) What is the linear charge density of the wire? 3.) What is the electric field at a point 7.8 cm away from the surface of the wire?

Relevant Equations: E (electric field of sheet of charge) = uniform charge density / 2 (8.85 x 10^-12 C^2 / N*m^2 )
Electric flux = E(electric field) * A(area)
Q(Charge inside) = charge density * A(area)
E (electric field of a cylinder) = Charge per unit of length / (2*pi*r*(8.85 x 10^-12 C^2 / N*m^2))

(Please include formulas you used)

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Mar 18, 2021

PeroK

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According to the guidelines, we need to see your best effort at solving this problem yourself:

https://www.physicsforums.com/threads/homework-help-guidelines-for-students-and-helpers.686781/

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...

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