The space between the plates of a flat capacitor is filled with a multilayer dielectric (figure), which has weak electrical conductivity. The dielectric constant and conductivity change from e1, l1 at one plate to e2, l2 at the other plate. The capacitor is connected to a circuit with a constant EMF. Determine the magnitude and sign of the total free charge q concentrated in the volume of the dielectric when a constant electric current I is established in the circuit, flowing through the dielectric in the direction from
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