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# Two identical particles each of mass M and charge Q are placed a certain distance part. If they are in equilibrium under mutual gravitational and electric force then calculate the order of QM in SI units.

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#### As the given system of charges are in equilibrium,hence Fe=FgFe is the electric force between the charges which is repelling them while Fg is the gravitational force of attraction.ie. KQ2R2=GM2R2or , KQ2=GM2 or , (QM)2=(GK)or , QM=(GK)12as G = 6.67×10−11Nm2/Kg2and K = 9×109Nm2/C2(QM)2=(6.67×10−11)(9×109)or QM=[0.7411×10−(11+9)]12 or QM=(0.7411×10−20)12we get QM=0.86×10−10 c / kg

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