# 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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