일반물리학 2 — Circuits: Problem 34

34 In Fig. 27-40a, both batteries have emf $\mathcal{E} = 1.20 \text{ V}$ and the external resistance $R$ is a variable resistor. Figure 27-40b gives the electric potentials $V$ between the terminals of each battery as functions of $R$: Curve 1 corresponds to battery 1, and curve 2 corresponds to battery 2. The horizontal scale is set by $R_s = 0.40 \text{ }\Omega$. What is the internal resistance of (a) battery 1 and (b) battery 2?