A hollow cylindrical conductor of radii R₁ andR₂ carries a current of I uniformly distributed over itscross-section. Using Ampere's law, show (a) that the magnetic fieldat r>R₁ is Î¼₀I/2Ïr, (b) that the field forR1<r<R2 isÎ¼₀I(r²-R₁²)/[2Ï(R₂²-R₁²)r]and (c) that the field is zero for r<R₁

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