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

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

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

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

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

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

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

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

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

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

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

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 $\Omega$

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

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 $\Omega$ 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:

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:

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- $\Omega$ 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:

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

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:

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: