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A small brass having a positive charge o...

A small brass having a positive charge of `1.7xx10^(-8)` C is made to touch another sphere of the same radius having a negative charge of `3.0xx10^(-9) C`. Find the force between them when they are separated by a distance of 20 cm. What will be the force between them when they are immersed in an oil of dielectric constant 3 ?

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