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A piece of coaxial cable of length L, inner radius a and outer radius b is...

A piece of coaxial cable of length L, inner radius a and outer radius b is loaded with a +K charge on the inner cylinder and a –2K charge on the outer cylinder
 Using Gauss's Law, determine: 
 a. The radial electric field at external points of the cylindrical shell
 b. The net load on the cylindrical shell
 c. The electric field between the bar regions and the cylindrical shell
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