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The electrostatic force on a small sphe...

The electrostatic force on a small sphere of charge 0.4 `mu` c due to another small sphere of charge -0.8 `mu` c in air is 0.2 N (a) What is the distance between the two spheres (b) what is the force on the second sphere due to the first

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(a) 12 cm
(b) 0.2 N (attractive)
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