The electrostatic force on a small sphe...

The electrostatic force on a small sphere of charge `0.4 muC` due to another small sphere of charge `−0.8μC` in air is `0.2N`. (a) What is the distance between the two spheres ?(b) What is the force on the second spere due to the first ?

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

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