Лаг1989 задача №12.45

The charges are evenly distributed over the surface of two concentric spheres with radii R₁ = 10 and R₂ = 15 cm, the surface charge density on both spheres is the same: σ = 2.5nC / m2. Find: a) the potential difference of the spheres ∆φ; b) the potential of the outer sphere φ₂.

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