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1. 1. 2. 3. 4. 5. The figure shows an {image} circuit with a switch and a 440-volt battery. What is the current in the circuit and the potential difference between points a and b, {image} , at the instant the switch is closed? {applet} • {image} , {image} • {image} , {image} • {image} , {image} • {image} , {image} • {image} , {image}

2. 1. 2. 3. 4. 5. The switch in the figure is closed at {image} when the current {image} is zero. When {image} , what is the potential difference across the inductor? {applet} • {image} • {image} • {image} • {image} • {image}

3. 1. 2. 3. 4. 5. Before the switch is closed in the figure, the potential across the capacitor is 180 V. At some instant after the switch is closed, the instantaneous current is 0.75 A. What is the energy in the capacitor at this instant? {applet} • {image} • {image} • {image} • {image} • {image}

4. 1. 2. 3. 4. 5. A circuit contains two inductors of 6.0 mH inductance in series placed in parallel with an inductor of 7.6 mH inductance. After one of the 6.0 mH inductors burns out, the repair person wants to replace all three inductors with one inductor of equivalent inductance. What inductance should she use? • {image} • {image} • {image} • {image} • {image}

5. 1. 2. 3. 4. 5. A circuit contains two inductors of 7.0 mH inductance in parallel placed in series with an inductor of 6.3 mH inductance. After one of the 7.0 mH inductors burns out, the repairman wants to replace all three inductors with one inductor of equivalent inductance. What inductance should he use? • {image} • {image} • {image} • {image} • {image}

6. 1. 2. 3. 4. 5. Suppose a switch is closed, completing an LR series circuit. How much time (in terms of time constants) is needed for the current to reach one half its maximum value? • {image} • {image} • {image} • {image} • {image}

7. 1. 2. 3. 4. 5. A series LC circuit contains a 118 mH inductor, a 36.0 mF capacitor and a 12 V battery. What is the period of the electromagnetic oscillations in the circuit? • {image} • {image} • {image} • {image} • {image}

8. 1. 2. 3. 4. 5. A series LC circuit contains a 138 mH inductor, a 36.0 mF capacitor and a 12 V battery. What is the frequency of the electromagnetic oscillations in the circuit? • {image} • {image} • {image} • {image} • {image}

9. 1. 2. 3. 4. 5. A series LC circuit contains a 149 mH inductor, a 40.0 mF capacitor and a 12 V battery. What is the angular frequency of the electromagnetic oscillations in the circuit? • {image} • {image} • {image} • {image} • {image}

10. 1. 2. 3. 4. 5. For the circuit shown, what is the rate of change of the current in the inductor when the current in the battery is 0.57 A? {applet} • {image} • {image} • {image} • {image} • {image}

11. 1. 2. 3. 4. 5. Which of the following are the units of a henry and a farad respectively? • {image} and {image} • {image} and {image} • {image} and {image} • {image} and {image} • none of the above

12. There is no current in the circuit shown in the figure below until the switch is closed. The current through the {image} resistor the instant after the switch is closed is either [1] 18 A or [2] 4.3 A, and the current through the {image} resistor after the switch has been closed a long time is either [3] 4.3 A or [4] 18 A. Which combination of the above choices is right? {applet} • [1] and [4] • [2] and [4] • [1] and [3] • [2] and [3] • None of these

13. 1. 2. 3. 4. 5. Suppose a switch is closed, completing an LR series circuit. How much time (in terms of time constants) is needed for the current to reach three fifths its maximum value? • {image} • {image} • {image} • {image} • {image}

14. 1. 2. 3. 4. 5. What is the inductance of a series {image} circuit in which {image} if the current increases to one-third of its final value in {image} ? • {image} • {image} • {image} • {image} • none of the above

15. The circuit in the figure below includes a power source that provides a sinusoidal voltage. Thus, the magnetic field in the inductor is constantly changing. The inductor is a simple air-core solenoid. The switch in the circuit is closed and the light bulb glows steadily. An iron rod is inserted into the interior of the solenoid, which increases the magnitude of the magnetic field in the solenoid. {image} As this happens, the brightness of the light bulb _____. • increases • decreases • is unaffected

16. In the figure below, coil 1 is moved closer to coil 2, with the orientation of both coils remaining fixed. {image} Because of this movement, the mutual induction of the two coils _____. • increases • decreases • is unaffected

17. At an instant of time during the oscillations of an {image} circuit, the current is at its maximum value. At this instant, the voltage across the capacitor _____. • is equal to that across the inductor • is zero • has its maximum value • is impossible to determine

18. At an instant of time during the oscillations of an {image} circuit, the current is momentarily zero. At this instant, the voltage across the capacitor _____. • is equal to that across the inductor • is zero • has its maximum value • is impossible to determine