Infinite hollow cylinder

Find the magnetic field at the horizontal distance of \(2\text{ m}\) from the center of a horizontal infinite hollow cylinder of inner radius \( 1\text{ m}\) and outer radius \(3\text{ m}\).

\(I_\text{current} = \dfrac1{\mu_0} \text{ ampere} \).

If your answer as \( \dfrac ab \pi \), where \(a\) and \(b\) are coprime positive integers, submit \(a+b\).

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