The energy density in a parallel plate capacitor is 2 x 10-8 J/m³. Find the electric intensity in the region between the plates when the medium is air.

Two parallel, flat, conducting plates with equal but opposite charges are separated by a uniform layer of insulating material with a dielectric constant of 7.1 and a thickness of 1.7mmmm. The electric field in the dielectric material is 2.22MV/mMV/m. What is the magnitude, in microcoulombs per squared meter, of the surface charge density on the conducting plates? What is the magnitude, in microcoulombs per squared meter, of the surface charge density on the conducting plates?

A 2.0 cm x 2.0 cm parallel-plate capacitor has a 1.0 mm spacing. The electric field strength inside the capacitor is 1.5×105 V/m. Potential difference across the capacitor =150 volts How much charge is on each plate?

Consider a parallel-plate capacitor with plate separation d, plate area A, whose plates have charge ±Q. A particle of charge q < 0 and mass m is released from rest at the negative plate of the capacitor and allowed to accelerate towards the positive plate. With what speed does the charge strike the positive plate? Answer in terms of d, A, Q, q, m, and/or e0.