place the charge q= 2.10-5C at the origin O of the Oxy-axis system. consider two points A(6;0) and B(3;4) on the axes with unit of measurement in cm. choose the potential origin at infinity. Calculate the work done by the electric field when moving the charge q=-1uc from A to B

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.