Summary AP Physics C: E&M - OpenStax University Physics Volume 2, Chapter 14 Conceptual Problems 11, 12, 15, 16, 19, 35, 36, 37, 46, 52

AP Physics C: Electricity and Magnetism. OpenStax University Physics Volume 2, Chapter 14 Conceptual Problems 11, 12, 15, 16, 19, 35, 36, 37, 46, 52 14.4 RL Circuits 11. Use Lenz’s law to explain why the initial current in the RL circuit of Figure 14.12(b) is zero. 12. When the current in the RL circuit of Figure 14.12(b) reaches its final value ε/R, what is the voltage across the inductor? Across the resistor? 15. At what time is the voltage across the inductor of the RL circuit of Figure 14.12(b) a maximum? 16. In the simple RL circuit of Figure 14.12(b), can the emf induced across the inductor ever be greater than the emf of the battery used to produce the current? 19. Describe how the currents through R1 and R2 shown below vary with time after switch S is closed. 14.2 Self-Inductance and Inductors 35. An emf of 0.40 V is induced across a coil when the current through it changes uniformly from 0.10 to 0.60 A in 0.30 s. What is the self-inductance of the coil? 36. The current shown in part (a) below is increasing, whereas that shown in part (b) is decreasing. In each case, determine which end of the inductor is at the higher potential. 37. What is the rate at which the current though a 0.30-H coil is changing if an emf of 0.12 V is induced across the coil? 14.3 Energy in a Magnetic Field 46. At the instant a current of 0.20 A is flowing through a coil of wire, the energy stored in its magnetic field is 6.0×10−3J. What is the self-inductance of the coil? 14.4 RL Circuits 52. In Figure 14.12, ε=12V, L=20mH, and R=5.0Ω. Determine (a) the time constant of the circuit, (b) the initial current through the resistor, (c) the final current through the resistor, (d) the current through the resistor when t=2τL, and (e) the voltages across the inductor and the resistor when t=2τL.