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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