$A$ and $C$ are concentric conducting spherical shells of radius $a$ and $c$ respectively. $A$ is surrounded by a concentric dielectric of inner radius $a$, outer radius $b$ and dielectric constant $k$. If sphere $A$ is given a charge $Q$, the potential at the outer surface of the dielectric is.
Medium
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Dielectric will don't exert any effect on the outside electric field so potential at $\mathrm{B}=\frac{\mathrm{KQ}}{\mathrm{b}}$
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