複選題

14. A solid sphere of radius R has a volume charge density \( \rho = ar/R \), where r is radial distance from the sphere's center.
(A)The Gaussian law cannot be applied in this case
(B)the sphere's total charge is \( a\pi R^3 \)

 
(C)the magnitude of the electric field at r = 0 is zero

(D)the magnitude of the electric field at r = R/2 is 1/16  αR/ε₀,
(E)the magnitude of the electric field at r = R is αR/ε₀

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