A small brass sphere having a positive charge of 1.7×10^-8C is made to touch another sphere of the same radius having a-3.0×10^-9C. Find the force between them when they are separated by a distance of 20cm. What will be the force between them when they are immerses in an oil of dielectric constant 3
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使具有1.7×10 ^ -8C正电荷的小黄铜球接触具有a-3.0×10 ^ -9C的相同半径的另一个球。当它们分开一定距离时，找出它们之间的力
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