Find by how much will the mass be changed

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A 12.9-g mass is suspended 3.45 cm above a nonconducting flat plate, directly above an embedded charge of q. If the mass has the same charge, q, how much must q be so that the mass levitates (just floats, neither rising nor falling)? If the charge q is produced by adding electrons to the mass, by how much will the mass be changed?

Reference no: EM13524241

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