21.70. A dipole consisting of charges Ee, 220 nm apart, is placed between two very large (essentially infinite) sheets carrying equal but opposite charge densities of 125 C/m. (a) What is the maxi- mum potential energy this dipole can have due to the sheets, and how should it be oriented relative to the sheets to attain this value? (b) What is the maximum torque the sheets can exert on the dipole, and how should it be oriented relative to the sheets to attain this value? (c) What net force do the two sheets exert on the dipole