Capacitance per length of co-axial cabel

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Find the capacitance per length of a co-axial cable with a conductor of radius a and a thin shield of
radius b.
 
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Again, what have you done so far? Think of terms of Gauss law.
 
i got the answer 2π€/ln(b/a)

is it correct?
 
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Yep, should be.
 
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