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A cylindrical wire of radius R is carrying a current I. If the current density is uniform over the cross-section of the wire, the magnetic field profile as function of radial distance r is-

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For a cylindrical wire of radius R is carrying a current I, magnetic field for r<R, B\ \alpha\ r and for r>R 
                           B\alpha \frac{1}{R}

 \therefore The curve is 

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