4 Suppose the electric field in some region is found to be E=kr³r̂, in spherical coordinates (k is a constant). Find the charge density ρ
(A)ε₀kr²
(B)2ε₀kr²
(C)3ε₀kr²
(D)4ε₀kr²
(E)5ε₀kr²

相關試題

相關試卷