A parallel plate capacitor of capacitance C is charged to Q by using a battery of potential V. Without disconnecting the battery, the distance between the plates is tripled and a dielectric medium of K = 10 is introduced between the plates of the capacitor. Then the new charge stored in the capacitor is A) (6 Q)/10
B) (3 Q)/10
C) (10 Q)/3

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.