In a ionic liquid, electric currents are carried by both positive and negative ions. an electric field is set up in a cylinder of cross-sectional area a. positive ions drift to the right with speed v1 and negative charges drift to the left with speed v2. the liquid is neutral so the density of positive and negative charge carriers are both equal to n. the positive ions have charge +e and the negative ions have charge -e. what is the current? (a) i = enavi + enav2 to the right (b) i = enavi + en av2 to the left (c) i = enav1 - enav2 to the right (d) i = enav1- en av2 to the left