In a long cylindrical wire of radius R, magnetic induction varies with the distance from axis as B=crᵃ. Find the function of current density in wire with the distance from axis of wire.

A. [(α+1)C/μ0]rᵃ⁺¹
B. [(α−1)/μ0]rᵃ⁺¹
C. [(α+1)C/μ0]rᵃ⁻¹
D. [(α−1)/μ0]r¹⁻ᵃ