One positive charge is placed on a horizontal surface. It has a mass of 10 kg. A

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One positive charge is placed on a horizontal surface. It has a mass of 10 kg. A second positive charge is placed directly above the charge on the surface. The normal force on the charge on the surface 127.9 Newtons. If the positive charge which is above the charge at the surface is replaced by a negative charge of the same magnitude (just opposite sign as the original charge and at the same distance to the charge on the surface as the original charge), what is the normal force on the charge on the surface now in Newtons?

Please show any conversions.

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