a parallel-plate capacitor is oriented horizontally and charged
so that there is an electric field of 50,000 V/m pointing up inside
the gap of 1cm, which is filled with air. a.) With the charge on
each plate remaining constant, the capacitor is immersed half-way
in an oil of dielectric constant K=2.5 What is now the potential
difference between the plates? b.) If on top of the oil, water
(K=80) is poured to completely fill the upper part of the gap,...