Question 1

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 2

Four wires meet at a junction.The first carries 4 A into the junction, the second carries 5 A out of the junction, and the third carries 2 A out of the junction.The fourth carries:

Accepted Answer

A) 7 A out of the junction 
B) 7 A into the junction 
C) 3 A out of the junction 
D) 3 A into the junction 
E) 1 A into the junction 
A) 7 A out of the junction 
B) 7 A into the junction 
C) 3 A out of the junction 
D) 3 A into the junction 
E) 1 A into the junction

Question 3

A battery with an emf of 12 V and an internal resistance of 1 $\Omega$is used to charge a battery with an emf of 10 V and an internal resistance of 1 $\Omega$.The current in the circuit is:

Accepted Answer

A) 1 A 
B) 2 A 
C) 4 A 
D) 11 A 
E) 22 A 
A) 1 A 
B) 2 A 
C) 4 A 
D) 11 A 
E) 22 A

Question 4

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 5

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 6

A total resistance of 3.0 $\Omega$is to be produced by combining an unknown resistor R with a 12 $\Omega$ resistor.What is the value of R and how is it to be connected to the 12 $\Omega$resistor?

Accepted Answer

A) 2.4$\Omega$, parallel 
B) 2.4 $\Omega$, series 
C) 4.0$\Omega$, parallel 
D) 4.0 $\Omega$, series 
E) 9.0 $\Omega$, series 
A) 2.4$\Omega$, parallel 
B) 2.4 $\Omega$, series 
C) 4.0$\Omega$, parallel 
D) 4.0 $\Omega$, series 
E) 9.0 $\Omega$, series

Question 7

A certain ammeter has an internal resistance of 1 $\Omega$ and a range from 0 to 50 mA.To make its range from 0 to 5 A, use:

Accepted Answer

A) a series resistance of 99 $\Omega$ 
B) an extremely large (say 106 $\Omega$)series resistance 
C) a resistance of 99 $\Omega$ in parallel 
D) a resistance of 1/99 $\Omega$ in parallel 
E) a resistance of 1/1000 $\Omega$ in parallel 
A) a series resistance of 99 $\Omega$ 
B) an extremely large (say 106 $\Omega$)series resistance 
C) a resistance of 99 $\Omega$ in parallel 
D) a resistance of 1/99 $\Omega$ in parallel 
E) a resistance of 1/1000 $\Omega$ in parallel

Question 8

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 9

In the circuit shown, the capacitor is initially uncharged, and V = 10 V.At time t = 0, switch S is closed.If  $ \tau $ denotes the time constant, the approximate current through the 3 $\Omega$resistor when t =  $ \tau $/10 is:

Accepted Answer

A) 0.50 A 
B) 0.75 A 
C) 1.0 A 
D) 1.5 A 
E) 3.0 A 
A) 0.50 A 
B) 0.75 A 
C) 1.0 A 
D) 1.5 A 
E) 3.0 A

Question 10

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 11

A 3-$\Omega$ and a 1.5-$\Omega$ resistor are wired in parallel and the combination is wired in series to a 4-$\Omega$resistor and a 10-V emf device.The potential difference across the 3-$\Omega$resistor is:

Accepted Answer

A) 2.0 V 
B) 6.0 V 
C) 8.0 V 
D) 10 V 
E) 12 V 
A) 2.0 V 
B) 6.0 V 
C) 8.0 V 
D) 10 V 
E) 12 V

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

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

Exam 27: Circuits

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:

Four wires meet at a junction.The first carries 4 A into the junction, the second carries 5 A out of the junction, and the third carries 2 A out of the junction.The fourth carries:

A battery with an emf of 12 V and an internal resistance of 1 Ω\OmegaΩ is used to charge a battery with an emf of 10 V and an internal resistance of 1 Ω\OmegaΩ .The current in the circuit 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:

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:

A total resistance of 3.0 Ω\OmegaΩ is to be produced by combining an unknown resistor R with a 12 Ω\OmegaΩ resistor.What is the value of R and how is it to be connected to the 12 Ω\OmegaΩ resistor?

A certain ammeter has an internal resistance of 1 Ω\OmegaΩ and a range from 0 to 50 mA.To make its range from 0 to 5 A, use:

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 circuit shown, the capacitor is initially uncharged, and V = 10 V.At time t = 0, switch S is closed.If τ \tau τ denotes the time constant, the approximate current through the 3 Ω\OmegaΩ resistor when t = τ \tau τ /10 is:

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 3- Ω\OmegaΩ and a 1.5- Ω\OmegaΩ resistor are wired in parallel and the combination is wired in series to a 4- Ω\OmegaΩ resistor and a 10-V emf device.The potential difference across the 3- Ω\OmegaΩ resistor 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:

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

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Filters

A battery with an emf of 12 V and an internal resistance of 1 $\Omega$ is used to charge a battery with an emf of 10 V and an internal resistance of 1 $\Omega$ .The current in the circuit is:

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 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 total resistance of 3.0 $\Omega$ is to be produced by combining an unknown resistor R with a 12 $\Omega$ resistor.What is the value of R and how is it to be connected to the 12 $\Omega$ resistor?

A certain ammeter has an internal resistance of 1 $\Omega$ and a range from 0 to 50 mA.To make its range from 0 to 5 A, use:

A 3- $\Omega$ and a 1.5- $\Omega$ resistor are wired in parallel and the combination is wired in series to a 4- $\Omega$ resistor and a 10-V emf device.The potential difference across the 3- $\Omega$ resistor is:

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: