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1) A dielectric sphere with a dielectric constant εr = 3 and a radius a =...

1) A dielectric sphere with a dielectric constant εr = 3 and a radius a = 2 m has a uniformly distributed total charge of Q = 1 μC on the surface. The environment outside the sphere is the cavity. Electrostatic energy in the cavity; Calculate separately with the formulas i) ?=1/2∫????? and ii) ?=1/2∫?⃗ ?⃗⃗ ??. How did the results you find change if the sphere was conductive?

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