[領域]據說是高斯定理

[來源]課本習題

[題目]Neutral hydrogen can be modeled as a positive point charge +e surround by
 a distribution of negative charge with volume density given by
ρ( r )=-A(e)^(-2r/a0) where a0=0.53×10^(-10) m is called the Bohr radius, and
 A is a constant such that the total amount of negative charge is –e.
(a)     What is the net charge inside a sphere of radius a0？
(b)     What is the strength of the electric field at a distance a0 from the nucleus?


[瓶頸]我沒有頭緒啊QQ...


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