Question 1

The emf of a battery is equal to its terminal potential difference:

Accepted Answer

A)  under all conditions 
B)  only when the battery is being charged 
C)  only when a large current is in the battery 
D)  only when there is no current in the battery 
E)  under no conditions 
A)  under all conditions 
B)  only when the battery is being charged 
C)  only when a large current is in the battery 
D)  only when there is no current in the battery 
E)  under no conditions D

Question 2

Resistor 1 has twice the resistance of resistor 2. The two are connected in series and a potential difference is maintained across the combination. The rate of thermal energy dissipation in 1 is:

Accepted Answer

A)  the same as that in 2 
B)  twice that in 2 
C)  half that in 2 
D)  four times that in 2 
E)  one fourth that in 2 
A)  the same as that in 2 
B)  twice that in 2 
C)  half that in 2 
D)  four times that in 2 
E)  one fourth that in 2 B

Question 3

"The sum of the emf's and potential differences around a closed loop equals zero" is a consequence of:

Accepted Answer

A)  Newton's third law 
B)  Ohm's law 
C)  Newton's second law 
D)  conservation of energy 
E)  conservation of charge 
A)  Newton's third law 
B)  Ohm's law 
C)  Newton's second law 
D)  conservation of energy 
E)  conservation of charge D

Question 4

Two wires are made of the same material and have the same length but different radii. They are joined end-to-end and a potential difference is maintained across the combination. Of the following the quantity that is the same for both wires is:

Accepted Answer

A)  potential difference 
B)  current 
C)  current density 
D)  electric field 
E)  conduction electron drift speed 
A)  potential difference 
B)  current 
C)  current density 
D)  electric field 
E)  conduction electron drift speed

Question 5

In the diagrams, all light bulbs are identical and all emf devices are identical. In which circuit (I, II, III, IV, V) will the bulbs glow with the same brightness as in circuit X?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 6

The resistance of resistor 1 is twice the resistance of resistor 2. The two are connected in series and a potential difference is maintained across the combination. Then:

Accepted Answer

A)  the current in 1 is twice that in 2 
B)  the current in 1 is half that in 2 
C)  the potential difference across 1 is twice that across 2 
D)  the potential difference across 1 is half that across 2 
E)  none of the above are true 
A)  the current in 1 is twice that in 2 
B)  the current in 1 is half that in 2 
C)  the potential difference across 1 is twice that across 2 
D)  the potential difference across 1 is half that across 2 
E)  none of the above are true

Question 7

Two wires made of the same material have the same length but different diameters. They are connected in series to a battery. The quantity that is the same for the wires is:

Accepted Answer

A)  the end-to-end potential difference 
B)  the current 
C)  the current density 
D)  the electric field 
E)  the electron drift velocity 
A)  the end-to-end potential difference 
B)  the current 
C)  the current density 
D)  the electric field 
E)  the electron drift velocity

Question 8

A certain capacitor, in series with a 720-$\Omega$resistor, is being charged. At the end of 10 ms its charge is half the final value. The capacitance is about:

Accepted Answer

A)  9.6 $\mu$F 
B)  14 $\mu$F 
C)  20 $\mu$F 
D)  7.2 F 
E)  10 F 
A)  9.6 $\mu$F 
B)  14 $\mu$F 
C)  20 $\mu$F 
D)  7.2 F 
E)  10 F

Question 9

In an antique automobile, a 6-V battery supplies a total of 48 W to two identical headlights in parallel. The resistance (in ohms) of each bulb is:

Accepted Answer

A)  0.67 
B)  1.5 
C)  3 
D)  4 
E)  8 
A)  0.67 
B)  1.5 
C)  3 
D)  4 
E)  8

Question 10

A certain voltmeter has an internal resistance of 10,000  $\Omega$ and a range from 0 to 100 V. To give it a range from 0 to 1000 V, one should connect:

Accepted Answer

A)  100,000  $\Omega$ in series 
B)  100,000  $\Omega$ in parallel 
C)  1000  $\Omega$ in series 
D)  1000  $\Omega$ in parallel 
E)  90,000  $\Omega$ in series 
A)  100,000  $\Omega$ in series 
B)  100,000  $\Omega$ in parallel 
C)  1000  $\Omega$ in series 
D)  1000  $\Omega$ in parallel 
E)  90,000  $\Omega$ in series

Question 11

Two wires made of the same material have the same length but different diameter. They are connected in parallel to a battery. The quantity that is NOT the same for the wires is:

Accepted Answer

A)  the end-to-end potential difference 
B)  the current 
C)  the current density 
D)  the electric field 
E)  the electron drift velocity 
A)  the end-to-end potential difference 
B)  the current 
C)  the current density 
D)  the electric field 
E)  the electron drift velocity

Question 12

A certain voltmeter has an internal resistance of 10,000  $\Omega$ and a range from 0 to 12 V. To extend its range to 120 V, use a series resistance of:

Accepted Answer

A)  1,111  $\Omega$ 
B)  90,000  $\Omega$ 
C)  100,000  $\Omega$ 
D)  108,000  $\Omega$ 
E)  120,000  $\Omega$ 
A)  1,111  $\Omega$ 
B)  90,000  $\Omega$ 
C)  100,000  $\Omega$ 
D)  108,000  $\Omega$ 
E)  120,000  $\Omega$

Question 13

A battery of emf 24 V is connected to a 6- $\Omega$ resistor. As a result, current of 3 A exists in the resistor. The terminal potential difference of the battery is:

Accepted Answer

A)  0 
B)  6 V 
C)  12 V 
D)  18 V 
E)  24 V 
A)  0 
B)  6 V 
C)  12 V 
D)  18 V 
E)  24 V

Question 14

A certain capacitor, in series with a resistor, is being charged. At the end of 10 ms its charge is half the final value. The time constant for the process is about:

Accepted Answer

A)  0.43 ms 
B)  2.3 ms 
C)  6.9 ms 
D)  10 ms 
E)  14 ms 
A)  0.43 ms 
B)  2.3 ms 
C)  6.9 ms 
D)  10 ms 
E)  14 ms

Question 15

An initially uncharged capacitor C is connected in series with resistor R. This combination is then connected to a battery of emf V0. Sufficient time elapses so that a steady state is reached. Which of the following statements is NOT true?

Accepted Answer

A)  The time constant is independent of V0 
B)  The final charge on C is independent of R 
C)  The total energy dissipated by R is independent of R 
D)  The total energy dissipated by R is independent of V0 
E)  The initial current (just after the battery was connected) is independent of C 
A)  The time constant is independent of V0 
B)  The final charge on C is independent of R 
C)  The total energy dissipated by R is independent of R 
D)  The total energy dissipated by R is independent of V0 
E)  The initial current (just after the battery was connected) is independent of C

Question 16

In the context of the loop and junctions rules for electrical circuits a junction is:

Accepted Answer

A)  where a wire is connected to a resistor 
B)  where a wire is connected to a battery 
C)  where only two wires are joined 
D)  where three or more wires are joined 
E)  where a wire is bent 
A)  where a wire is connected to a resistor 
B)  where a wire is connected to a battery 
C)  where only two wires are joined 
D)  where three or more wires are joined 
E)  where a wire is bent

Question 17

For any circuit the number of independent equations containing emf's, resistances, and currents equals:

Accepted Answer

A)  the number of junctions 
B)  the number of junctions minus 1 
C)  the number of branches 
D)  the number of branches minus 1 
E)  the number of closed loops 
A)  the number of junctions 
B)  the number of junctions minus 1 
C)  the number of branches 
D)  the number of branches minus 1 
E)  the number of closed loops

Question 18

When switch S is open, the ammeter in the circuit shown reads 2.0 A. When S is closed, the ammeter reading:

Accepted Answer

A)  increases slightly 
B)  remains the same 
C)  decreases slightly 
D)  doubles 
E)  halves 
A)  increases slightly 
B)  remains the same 
C)  decreases slightly 
D)  doubles 
E)  halves

Question 19

"The sum of the currents into a junction equals the sum of the currents out of the junction" is a consequence of:

Accepted Answer

A)  Newton's third law 
B)  Ohm's law 
C)  Newton's second law 
D)  conservation of energy 
E)  conservation of charge 
A)  Newton's third law 
B)  Ohm's law 
C)  Newton's second law 
D)  conservation of energy 
E)  conservation of charge

Question 20

In the figure, voltmeter V1 reads 600 V, voltmeter V2 reads 580 V, and ammeter A reads 100 A. The power wasted in the transmission line connecting the power house to the consumer is:

Accepted Answer

A)  1 kW 
B)  2 kW 
C)  58 kW 
D)  59 kW 
E)  60 kW 
A)  1 kW 
B)  2 kW 
C)  58 kW 
D)  59 kW 
E)  60 kW

Exam 27: Circuits

The emf of a battery is equal to its terminal potential difference:

Resistor 1 has twice the resistance of resistor 2. The two are connected in series and a potential difference is maintained across the combination. The rate of thermal energy dissipation in 1 is:

"The sum of the emf's and potential differences around a closed loop equals zero" is a consequence of:

Two wires are made of the same material and have the same length but different radii. They are joined end-to-end and a potential difference is maintained across the combination. Of the following the quantity that is the same for both wires is:

In the diagrams, all light bulbs are identical and all emf devices are identical. In which circuit (I, II, III, IV, V) will the bulbs glow with the same brightness as in circuit X?

The resistance of resistor 1 is twice the resistance of resistor 2. The two are connected in series and a potential difference is maintained across the combination. Then:

Two wires made of the same material have the same length but different diameters. They are connected in series to a battery. The quantity that is the same for the wires is:

A certain capacitor, in series with a 720- Ω\OmegaΩ resistor, is being charged. At the end of 10 ms its charge is half the final value. The capacitance is about:

In an antique automobile, a 6-V battery supplies a total of 48 W to two identical headlights in parallel. The resistance (in ohms) of each bulb is:

A certain voltmeter has an internal resistance of 10,000 Ω\OmegaΩ and a range from 0 to 100 V. To give it a range from 0 to 1000 V, one should connect:

Two wires made of the same material have the same length but different diameter. They are connected in parallel to a battery. The quantity that is NOT the same for the wires is:

A certain voltmeter has an internal resistance of 10,000 Ω\OmegaΩ and a range from 0 to 12 V. To extend its range to 120 V, use a series resistance of:

A battery of emf 24 V is connected to a 6- Ω\OmegaΩ resistor. As a result, current of 3 A exists in the resistor. The terminal potential difference of the battery is:

A certain capacitor, in series with a resistor, is being charged. At the end of 10 ms its charge is half the final value. The time constant for the process is about:

An initially uncharged capacitor C is connected in series with resistor R. This combination is then connected to a battery of emf V0. Sufficient time elapses so that a steady state is reached. Which of the following statements is NOT true?

In the context of the loop and junctions rules for electrical circuits a junction is:

For any circuit the number of independent equations containing emf's, resistances, and currents equals:

When switch S is open, the ammeter in the circuit shown reads 2.0 A. When S is closed, the ammeter reading:

"The sum of the currents into a junction equals the sum of the currents out of the junction" is a consequence of:

In the figure, voltmeter V1 reads 600 V, voltmeter V2 reads 580 V, and ammeter A reads 100 A. The power wasted in the transmission line connecting the power house to the consumer is:

Measurement

Motion Along a Straight Line

Vector

Motion in Two and Three Dimensions

Force and Motion I

Force and Motion II

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Fluids

Oscillations

Waves I

Waves II

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Electric Charge

Electric Fields

Gauss Law

Electric Potential

Capacitance

Current and Resistance

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Nuclear Physics

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters

A certain capacitor, in series with a 720- $\Omega$ resistor, is being charged. At the end of 10 ms its charge is half the final value. The capacitance is about:

A certain voltmeter has an internal resistance of 10,000 $\Omega$ and a range from 0 to 100 V. To give it a range from 0 to 1000 V, one should connect:

A certain voltmeter has an internal resistance of 10,000 $\Omega$ and a range from 0 to 12 V. To extend its range to 120 V, use a series resistance of:

A battery of emf 24 V is connected to a 6- $\Omega$ resistor. As a result, current of 3 A exists in the resistor. The terminal potential difference of the battery is:

An initially uncharged capacitor C is connected in series with resistor R. This combination is then connected to a battery of emf V₀. Sufficient time elapses so that a steady state is reached. Which of the following statements is NOT true?

In the figure, voltmeter V₁ reads 600 V, voltmeter V₂ reads 580 V, and ammeter A reads 100 A. The power wasted in the transmission line connecting the power house to the consumer is: