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Given that, An infinitely long circular follow cylinder of radius a. A surface current density Js = J_emptyset emptyset For outside the cylinder, magnetic field H = 0 Now field inside a cylinder (hollow) integral B de = mu_0 I_enc I_enc = integral J_emptyset ds Now, for r < a, there is no surface charge. So, J_emptyset = 0 at r < a So, I_enc = 0 Therefore, B = 0 Finally the magnetic field intensity H is also zero [Because H = B/mu]
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