Place one polarizing filter on top of a second so you have to look through both of them. Rotate one filer with respect to the other, keeping one stationary. Play around with them until you can answer the following questions. a. How are they oriented with respect to one another when maximum light is transmitted?
b. How are they oriented with respect to one another when no light is transmitted?
c. How is the intensity of transmitted light connected to the angle between the polarizers?

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.