A parallel plate condenser is immersed in an oil of dielectric constant $2$. The field between the plates is
AIncreased proportional to $ 2$
BDecreased proportional to $\frac{1}{2}$
CIncreased proportional to $\sqrt 2 $
DDecreased proportional to $\frac{1}{{\sqrt 2 }}$
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BDecreased proportional to $\frac{1}{2}$
b (b) ${E_{medium}} = \frac{{{E_{air}}}}{K} = \frac{E}{2}$
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