In some of these problems you may need to know that the mass of an electron is 9.11 x 10-31 kg, the mass of a proton is 1.67 x 10-27 kg, the electric charge of the electron is -1.6 x 10-19 C, and the charge of a proton is 1.6 x 10-19 C.
Use the superposition principle to draw E field lines for the two objects whose charges are given. Consider all objects to be point-like and choose the distance you want between them: (a) +q and +q; (b) +q and +3q; (c) +q and -q.
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