Benda 4 coulomb dan -18 coulomb menghasilkan gaya tarik menarik 18 . 10^{9} Newton. berapakah jarak kedua muatan itu jika k= 9 . 10^{9}
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ditanya = r = ....?
jawab = F= kQ1Q2/r
18x10^9= 9x10^9x4x(-18)/r
18x10^9xr=9x10^9x(-72)
r= (-648)x10^9/18x10^9
r= 36 m