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# Electrostatics: Charge density in a coaxial cable.

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We have a long coaxial cable with an inner solid wire of radius a and outer
metal shell of radius b. On the inner wire, the volume charge density is given by ks2 .
On the outer shell, the linear charge density (along the axis) is given by &#955;.
(a) Draw a picture that illustrates this arrangement.

(b) What is the linear charge density &#955; that will give E = 0 outside the cable?

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#### Solution Preview

electrostatics
We have a long coaxial cable with an inner solid wire of radius a and outer metal shell of radius b. On the inner wire, the volume charge density is given by ks2 . On the outer shell, the linear charge density (along the axis) is given by Î».
(a) Draw a picture that illustrates this arrangement.

(b) What is the linear charge ...

#### Solution Summary

The volume charge density as a function of radius on inner wire of cylindrical coaxial cable is given and the charge density on the outer cable is calculated.

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