A thin, square, conducting plate 52.5 cm on a side lies in the xy plane. A total charge of 3.25 10-8 C is placed on the plate. You may assume that the charge density is uniform. (a) Find the charge density on each face of the plate. (b) Find the electric field just above the plate. (c) Find the electric field just below the plate.

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.