Two infinitely long coaxial cylinders with radii r₁ = 10 and r₂ = 20 mm are charged with the same charges, and the surface charge density on the outer cylinder is σ₂ = 6.66 nC / m², and on the inner one σ₁ = 3.33 nC / ²2. Find the potential difference between the cylinders ∆φ.

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