some important formula used here
mass = volume * density
density "=\\frac43\\pi r^3"
Force by electric field = Force of gravity
"1.6\\times10^{-19}\\times E=\\frac{4\\pi\\times(10^{-7})^3}{3}\\times1000\\times10"
"E=2.61\\times10^{2}" volt/ m
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