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physics

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Two spherical objects are separated by a distance of 1.41 × 10^-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result, each object experiences an electrostatic force that has a magnitude of 1.40 × 10^-20 N. How many electrons did it take to produce the charge on one of the objects?

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    #'s 1 and 2 in Related Questions are nearly identical, the numbers are different, but the formula is what counts.

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