The charge of an electron is q = – 1.6 x 10-19C
The charge of a proton is q = + 1.6 x 10-19C
The strength of the electric field k = 8.9 x 109 Nm2 /C2
The strength of gravity G = 6.67 x10-11 Nm2 /kg2
The mass of an electron me = 9 x 10-31 kg
The mass of a proton mp = 2 x 10-27 kg
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