The number of significant digits in the mass of a body measuring 4200.0 kg is 2.

i just did an experiment like this in my science class. also the answer is yes, it will get separated because they are two opposites meaning if they are opposite they can not attract.

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the answer to this is proletariats.

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electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.