Electric Field outside a Coaxial Cable

AI Thread Summary
To determine the electric field outside a coaxial cable with a +30mC charge on the inner conductor and a -30mC charge on the outer braid, Gauss' Law is applied. The symmetry of the coaxial cable suggests that the electric field outside the outer conductor should be zero, as the charges are equal and opposite. A Gaussian surface placed outside the outer conductor confirms that the net enclosed charge is zero, leading to no electric field in that region. The discussion emphasizes the need for a clear demonstration of this conclusion using Gauss' Law. Ultimately, the electric field 4cm from the center of the cable is indeed zero.
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Homework Statement


Consider an 8mm diameter coaxial cable, which consists of a central conducting wire, and an outer cylindrical conducting braid. If a charge of +30mC is placed on the inner conductor, and a charge of -30mC is placed on the outer conducting braid, what will the electric field, in N/C, be 4cm from the center of the cable?


Homework Equations


Gauss' Law


The Attempt at a Solution


I'm thinking it would be 0 but I don't know how to go about showing this.
 
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Please show how you reached this conclusion.
 
WhoWee said:
Please show how you reached this conclusion.

calcuseless said:
...but I don't know how to go about showing this.

welp
 

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