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one electron has charge -1.6 x 10^(-19) coulumb.
Net charge of 1.4x10^7 electrons is 1.4x(-1.6)x10^(7)x10^(-19) coulomb, that is,-2.24x10^(-12) coulomb.
Thus ,net charge of 1.4x10^7 electrons is -2.24x10^(-12) coulomb.
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