A dust particle has an excess charge of 4.0 × 106 electrons and a mass of 5.0 × 10-8 g. It is initially held at d = 1.0 × 10-³ m directly above a fixed object of the same size that is charged with the same number of electrons. Both objects are in an evacuated container.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.