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[" 6.Force between two identical charges...

[" 6.Force between two identical charges placed at a distance "],[r" in vacuum is "F" .Now a slab of dielectric constant "K=4],[" is inserted between these two charges.The thickness of "],[" the slab is "r/2" .The force between the charges will now "],[" become "],[[" (a) "F/4," (b) "F/2," (c) "3F/5," (d) "4F/9]]

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