The force of repulsion between two identical positive charges when kept with the separation are in air is f half the gap between the two charges if filled by a dielectrib slab of dielectri constant 4
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it is given that, force of repulsion between two identical positive charge and when kept with separation r in air is f.
e.g., f = .....(1)
thickness of slab is filled between the charges , t = r/2
dielectric constant of slab, k = 4
force of repulsion when a slab is filled between charges , F =
=
=
from equation (1),
F = 4f/9
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