12. Two copper plates (each surface area is 4 cm2) are located parallel to each other at a distance of 11 cm. The space between them is filled with a 0.68 M CuSO4 solution. The molar electrical conductivity of this solution is 57.4 (Sm*cm2)/mol. Determine what alternating voltage must be applied to the plates in order for the current to be equal to 2.8 A.

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