How Is J₀ Calculated in a Wire with Nonuniform Current Density?

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A long, straight conducting wire of radius R has a nonuniform current density J=J_{}0*r/R , where J_{}0 is a constant. The wire carries total current I .Find an expression for J_{}0 in terms of I and R .
 
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You have to integrate: I=2\pi\int_0^R Jrdr.
 
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