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= k.q/r
600=k.q/r
600r=9x10⁹.q
q=600r/9x10⁹
q= 200.10⁹/3 .r, dimana r substitusikan.
sehingga
q=2,25x10-⁹ C ( ini jawabannya)
sedangkan medan listrik
=k.q/r²
100r²=9x10⁹q
r²=9x 10⁷q