Object $A$ is metallic and electrically neutral. It is charged by induction so that it acquires a charge of $-3\mathrm{.}19E-6C.$ Object $B$ is identical to object A and is also electrically neutral. It is charged by induction so that it acquires a charge of $+3\mathrm{.}19E-6C.$ Calculate the difference in mass between the charged objects.

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