One plate of the capacitor is fixed motionless at the bottom of a wide vessel with a liquid dielectric (its dielectric constant e, density p). The second, in the form of a bar of height H, floats above it, submerged to 1/4 of its volume if the plates are not charged. What potential difference must be applied to the plates so that the top plate is half immersed? The initial distance between the plates of the capacitor is H. The field between the plates is considered uniform.

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