Slide 1 / 21 AP Physics C Inductance Multiple Choice Slide 2 / 21 1 At time = 0, the switch is closed in the circuit shown below. Which of the following graphs best desribed the potential difference V, across the resistance as a function of time t? A B C E D Slide 3 / 21 2 If R is 1 ohm and L is 1 Henry, the L/R is A 1 volt B 1 farad 1 ampere C 1 coulomb D 1 second E
Slide 4 / 21 3 Questions 3-5 relate to the following circuit in which the switch S has been open for a long time. What is the instantaneous circuit at point X immediately after the switch is closed? A 0 ξ/R B ξ/2R C ξ/RL D ξL/2R E Slide 5 / 21 4 Questions 3-5 relate to the following circuit in which the switch S has been open for a long time. When the switch has been clsoed for a long time, what is the energy stored in the inductor? A Lξ/2R Lξ 2 /2R 2 B Lξ 2 /4R 2 C LR 2 /2ξ 2 D ξ 2 R 2 /4L E Slide 6 / 21 5 Questions 3-5 relate to the following circuit in which the switch S has been open for a long time. After the switch has been closed for a long time, it is opened at time t = 0. Which of the following graphs best represents the subsequent current I at point X as a function of time t? A B C D E
Slide 7 / 21 6 Questions 6-7 A circuit consists of a battery of voltage emf E, a resistor of resistance R, and an inductor of inductance L connected in series. The current is given by the function I = (E/R)(1-e -(R/L)t ) When the circuit is first connected which of the following represents the current through the resistor R? A zero B E/R E/R(1-e -R/L ) C e -R/L D E/Re -R/L E Slide 8 / 21 7 Questions 6-7 A circuit consists of a battery of voltage emf E, a resistor of resistance R, and an inductor of inductance L connected in series. The current is given by the function I = (E/R)(1-e-(R/L)t) Which of the following represents the time constant τ ? A RL E/RL B e -Rt/L C e -R/L D R/L E Slide 9 / 21 8 Which of the following is true about inductors? I. They store energy over a long time II. They resist the flow of current through it III. They can produce a magnetic field A I III B I and II C II and III D all of the above E
Slide 10 / 21 9 A resistor, an inductor, and a battery are connected in series. Which of the following represents the net voltage of the system? A iR + L(di/dt) iR - L(di/dt) B L(di/dt) C D iR I + L + di/dt + R E Slide 11 / 21 10 Questions 10-12 The circuit below has the switch initially in position A. Which of the following is true about the circuit? A The current rises instantly to 7.5 A then decreases to 0 The current rises instantly to 2 A then decreases to 0 B The current rises to 7.5 A and remains constant C D The current rises to 2 A and remains constat The current will remain constant after the switch closes E Slide 12 / 21 11 Questions 10-12 The circuit below has the switch initially in position A. The maximum energy the inductor stores is approximately A 0 8 J B C 16 J 60 J D 110 J E
Slide 13 / 21 12 Questions 10-12 The circuit below has the switch initially in position A. The switch is closed to junction b after a long time. Which of the following occurs? The current drops instantly to 0 A B The current drops uniformly to 0 over some time The current drops exponentially to 0 C D The current oscillates with a period of 0.05s The current oscillates with a period of 0.5s E Slide 14 / 21 13 Which of the following can act as an inductor? I. A long solenoid II. A loop of wire III. A conducting sphere A I III B I and II C II and III D all of the above E Slide 15 / 21 14 Questions 14-17 refer to the diagram below: What is the current in the inductor when the switch is closed to position A? A zero 0.2 A B 0.4 A C 2 A D E 20 A
Slide 16 / 21 15 Questions 14-17 refer to the diagram below: What is the current in the inductor when the switch has been closed in junction a for a long time? A zero 0.2 A B C 0.4 A 2 A D 20 A E Slide 17 / 21 16 Questions 14-17 refer to the diagram below: What is the current in the inductor when the switch is closed to junction b? A zero 0.2 A B 0.4 A C 2 A D E 20 A Slide 18 / 21 17 Questions 14-17 refer to the diagram below: What is the current in the inductor when the switch has been closed in junction b for a long time? A zero 0.2 A B 0.4 A C D 2 A 20 A E
Slide 19 / 21 18 An inductor is placed in series with a capacitor to a battery. which of the following represents the voltage of the battery? A qLdi/Cdt B q/c Ldi/dt C D q/C - Ldi/dt q/C + Ldi/dt E Slide 20 / 21 19 Questions 19-20 An inductor of inductance 0.5 H is connected in series to a resistor of 5 Ω to a 10 volt battery. Which of the following is the time constant t? A 0.01 s 0.05 s B 0.1 s C 2 s D 25 s E Slide 21 / 21 20 Questions 19-20 An inductor of inductance 0.5 H is connected in series to a resistor of 5 Ω to a 10 volt battery. What is the energy dissipated by this circuit? A 0 J 1 J B 4 J C 6.25 J D 25 J E
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