일반물리학 2 — Induction and Inductance: Problem 20

20 In Fig. 30-28, the inductor has 20 turns and the ideal battery has an emf of 16 V. Figure 30-29 gives the magnetic flux \(\Phi\) through each turn versus the current \(i\) through the inductor. The vertical axis scale is set by \(\Phi_s = 4.0 \times 10^{-4} \text{ T}\cdot\text{m}^2\), and the horizontal axis scale is set by \(i_s = 2.00 \text{ A}\). If switch S is closed at time \(t = 0\), at what rate \(di/dt\) will the current be changing at \(t = 1.5\tau_L\)?