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Two metal plates having charges Q and ...

Two metal plates having charges `Q and -Q` face each other at some separation and are dipped into an oil tank .If the oil is pumped out, the eletric field between the plates will

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Electric field in between the plates of a capacitor is `E=sigma//epsilon_(0)`. When the capacitor is submerged in a tank of oil, the electric field between the plates is `E=sigma//epsilon=sigma//epsilon_(0)epsilon_r`. Hence, electric field can be measured by measuring potential differnce between the plates `V` and then it can be calculated using `E=V//d`.
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