Question: An origin-centered sphere with permittivity and radius a is placed in a uniform external electric field E 0 . What radius b < a

An origin-centered sphere with permittivity ε and radius a is placed in a uniform external electric field E₀. What radius b < a should an origin-centered, perfectly conducting sphere similarly placed in a similar field E₀ have so that the two situations produce identical electric fields for r > a?

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