"E=\\frac{kq}{r^2}"
Where: E is electric field
r is distance=2M
q is charge=4nC
"k = constant = 9\u00d710^{9}"
"E= \\frac{9\u00d710^9\u00d74\u00d710^{-9}}{2^2}=9N\/C"
E=9N/C
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