AP Physics C Inductance Multiple Choice Slide 2 / 21 1 At time = - - PDF document

AP Physics C Inductance Multiple Choice

Slide 1 / 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 D E

Slide 2 / 21

2 If R is 1 ohm and L is 1 Henry, the L/R is

A 1 volt B

1 farad

C

1 ampere

D

1 coulomb

E

1 second

Slide 3 / 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 B

ξ/R

C

ξ/2R

D

ξ/RL

E

ξL/2R

Slide 4 / 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 B

Lξ2/2R2

C

Lξ2/4R2

D

LR2/2ξ2

E

ξ2R2/4L

Slide 5 / 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

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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 C

E/R(1-e-R/L)

D

e-R/L

E

E/Re-R/L

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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 B

E/RL

C

e-Rt/L

D

e-R/L

E

R/L

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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 B

III

C

I and II

D

II and III

E

all of the above

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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) B

iR - L(di/dt)

C

L(di/dt)

D

iR

E

I + L + di/dt + R

Slide 10 / 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 B

The current rises instantly to 2 A then decreases to 0

C

The current rises to 7.5 A and remains constant

D

The current rises to 2 A and remains constat

E

The current will remain constant after the switch closes

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11 Questions 10-12 The circuit below has the switch initially in position A. The maximum energy the inductor stores is approximately

A 0 B

8 J

C

16 J

D

60 J

E

110 J

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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?

A

The current drops instantly to 0

B

The current drops uniformly to 0 over some time

C

The current drops exponentially to 0

D

The current oscillates with a period of 0.05s

E

The current oscillates with a period of 0.5s

Slide 13 / 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 B

III

C

I and II

D

II and III

E

all of the above

Slide 14 / 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 B

0.2 A

C

0.4 A

D

2 A

E

20 A

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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 B

0.2 A

C

0.4 A

D

2 A

E

20 A

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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 B

0.2 A

C

0.4 A

D

2 A

E

20 A

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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 B

0.2 A

C

0.4 A

D

2 A

E

20 A

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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 C

Ldi/dt

D

q/C - Ldi/dt

E

q/C + Ldi/dt

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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 B

0.05 s

C

0.1 s

D

2 s

E

25 s

Slide 20 / 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 B

1 J

C

4 J

D

6.25 J

E

25 J

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