試題詳解

37. A solid nonconducting sphere of radius R carries a uniform charge density throughout its volume. ial distance r₁= R/4 from the center, the electric field has a magnitude E₀. magnitude of the electric field at a radial distance r₂ = 2R ?
(A) E₀/8
(B) E₀/4
(C) E₀/2
(D)E₀
(E)2E₀