Both batteries in Figure (a) are ideal. Emf , of battery 1 has a fixed value, but emf of battery 2 can be varied between 17.0 V and 170.0 V.

The plots in Figure (b) give the currents through the two batteries as a function of 8. The vertical scale is set by i 0.76 A. You must decide which plot corresponds to which battery, but for both plots, a negative current occurs when the direction of the current through the battery is opposite the direction of that battery's emf. What are (a) emf , (b) resistance R, and (c) resistance R2?