Question 1

The resistance of resistor 1 is twice the resistance of resistor 2.The two are connected in parallel 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 2

By using only two resistors, R1 and R2 a student is able to obtain resistances of 3 $\Omega$, 4 $\Omega$, 12$\Omega$, and 16 $\Omega$.The values of R1 and R2 are:

Accepted Answer

A) 3 $\Omega$, 4 $\Omega$ 
B) 2 $\Omega$, 12 $\Omega$ 
C) 3 $\Omega$, 16 $\Omega$ 
D) 4 $\Omega$, 12 $\Omega$ 
E) 4 $\Omega$, 16$\Omega$ 
A) 3 $\Omega$, 4 $\Omega$ 
B) 2 $\Omega$, 12 $\Omega$ 
C) 3 $\Omega$, 16 $\Omega$ 
D) 4 $\Omega$, 12 $\Omega$ 
E) 4 $\Omega$, 16$\Omega$

Question 3

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 4

A battery is connected across a parallel combination of two identical resistors.If the potential difference across the terminals is V and the current in the battery is i, then:

Accepted Answer

A) the potential difference across each resistor is V and the current in each resistor is i 
B) the potential difference across each resistor is V/2 and the current in each resistor is i/2 
C) the potential difference across each resistor is V and the current in each resistor is i/2 
D) the potential difference across each resistor is V/2 and the current in each resistor is i 
E) none of the above are true 
A) the potential difference across each resistor is V and the current in each resistor is i 
B) the potential difference across each resistor is V/2 and the current in each resistor is i/2 
C) the potential difference across each resistor is V and the current in each resistor is i/2 
D) the potential difference across each resistor is V/2 and the current in each resistor is i 
E) none of the above are true

Question 5

The terminal potential difference of a battery is less than its emf:

Accepted Answer

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

Question 6

Resistances of 2.0 $\Omega$, 4.0 $\Omega$, and 6.0 $\Omega$ and a 24-V emf device are all in series.The potential difference across the 2.0-$\Omega$ resistor is:

Accepted Answer

A) 4 V 
B) 8 V 
C) 12 V 
D) 24 V 
E) 48 V 
A) 4 V 
B) 8 V 
C) 12 V 
D) 24 V 
E) 48 V

Question 7

Four 20-$\Omega$resistors are connected in parallel and the combination is connected to a 20-V emf device.The current in the device is:

Accepted Answer

A) 0.25 A 
B) 1.0 A 
C) 4.0 A 
D) 5.0 A 
E) 100 A 
A) 0.25 A 
B) 1.0 A 
C) 4.0 A 
D) 5.0 A 
E) 100 A

Question 8

If a circuit has L closed loops, B branches, and J junctions the number of independent loop equations is:

Accepted Answer

A) B - J + 1 
B) B - J 
C) B 
D) L 
E) L - J 
A) B - J + 1 
B) B - J 
C) B 
D) L 
E) L - J

Question 9

Resistances of 2.0 $\Omega$, 4.0 $\Omega$, and 6.0$\Omega$and a 24-V emf device are all in series.The circuit is initially ungrounded.After grounding, the current in the circuit:

Accepted Answer

A) increases 
B) decreases 
C) does not change 
D) depends on where in the circuit the ground wire is attached 
E) depends on what the circuit is grounded to 
A) increases 
B) decreases 
C) does not change 
D) depends on where in the circuit the ground wire is attached 
E) depends on what the circuit is grounded to

Question 10

Four 20-$\Omega$ resistors are connected in parallel and the combination is connected to a 20-V emf device.The current in any one of the resistors is:

Accepted Answer

A) 0.25 A 
B) 1.0 A 
C) 4.0 A 
D) 5.0 A 
E) 100 A 
A) 0.25 A 
B) 1.0 A 
C) 4.0 A 
D) 5.0 A 
E) 100 A

Question 11

A series circuit consists of a battery with internal resistance r and an external resistor R.If these two resistances are equal (r = R)then the energy dissipated per unit time by the internal resistance r is:

Accepted Answer

A) the same as by R 
B) half that by R 
C) twice that by R 
D) one third that by R 
E) unknown unless the emf is given 
A) the same as by R 
B) half that by R 
C) twice that by R 
D) one third that by R 
E) unknown unless the emf is given

Question 12

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 13

A battery has an emf of 9 V and an internal resistance of 2 $\Omega$.If the potential difference across its terminals is greater than 9 V:

Accepted Answer

A) it must be connected across a large external resistance 
B) it must be connected across a small external resistance 
C) the current must be out of the positive terminal 
D) the current must be out of the negative terminal 
E) the current must be zero 
A) it must be connected across a large external resistance 
B) it must be connected across a small external resistance 
C) the current must be out of the positive terminal 
D) the current must be out of the negative terminal 
E) the current must be zero

Question 14

The time constant RC has units of:

Accepted Answer

A) second/farad 
B) second/ohm 
C) 1/second 
D) second/watt 
E) none of these 
A) second/farad 
B) second/ohm 
C) 1/second 
D) second/watt 
E) none of these

Question 15

Two identical batteries, each with an emf of 18 V and an internal resistance of 1$\Omega$, are wired in parallel by connecting their positive terminals together and connecting their negative terminals together.The combination is then wired across a 4-$\Omega$resistor.The potential difference across the 4-$\Omega$ resistor is:

Accepted Answer

A) 4.0 V 
B) 8.0 V 
C) 14 V 
D) 16 V 
E) 29 V 
A) 4.0 V 
B) 8.0 V 
C) 14 V 
D) 16 V 
E) 29 V

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

A galvanometer has an internal resistance of 12 $\Omega$ and requires 0.01 A for full scale deflection.To convert it to a voltmeter reading 3 V full scale, one must use a series resistance of:

Accepted Answer

A) 102 $\Omega$ 
B) 288 $\Omega$ 
C) 300 $\Omega$ 
D) 360 $\Omega$ 
E) 412 $\Omega$ 
A) 102 $\Omega$ 
B) 288 $\Omega$ 
C) 300 $\Omega$ 
D) 360 $\Omega$ 
E) 412 $\Omega$

Question 18

Here is a loop equation: .What does this equation represent?

Accepted Answer

A) a charging capacitor 
B) a discharging capacitor 
C) a capacitor that has been disconnected 
D) a charging resistor 
E) an oscillating circuit 
A) a charging capacitor 
B) a discharging capacitor 
C) a capacitor that has been disconnected 
D) a charging resistor 
E) an oscillating circuit

Question 19

A battery is connected across a series combination of two identical resistors.If the potential difference across the terminals is V and the current in the battery is i, then:

Accepted Answer

A) the potential difference across each resistor is V and the current in each resistor is i 
B) the potential difference across each resistor is V/2 and the current in each resistor is i/2 
C) the potential difference across each resistor is V and the current in each resistor is i/2 
D) the potential difference across each resistor is V/2 and the current in each resistor is i 
E) none of the above are true 
A) the potential difference across each resistor is V and the current in each resistor is i 
B) the potential difference across each resistor is V/2 and the current in each resistor is i/2 
C) the potential difference across each resistor is V and the current in each resistor is i/2 
D) the potential difference across each resistor is V/2 and the current in each resistor is i 
E) none of the above are true

Question 20

Resistor 1 has twice the resistance of resistor 2.They are connected in parallel to a battery.The ratio of the thermal energy dissipation by 1 to that by 2 is:

Accepted Answer

A) 1:4 
B) 1:2 
C) 1:1 
D) 2:1 
E) 4:1 
A) 1:4 
B) 1:2 
C) 1:1 
D) 2:1 
E) 4:1

Exam 27: Circuits

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

By using only two resistors, R1 and R2 a student is able to obtain resistances of 3 Ω\OmegaΩ , 4 Ω\OmegaΩ , 12 Ω\OmegaΩ , and 16 Ω\OmegaΩ .The values of R1 and R2 are:

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:

A battery is connected across a parallel combination of two identical resistors.If the potential difference across the terminals is V and the current in the battery is i, then:

The terminal potential difference of a battery is less than its emf:

Resistances of 2.0 Ω\OmegaΩ , 4.0 Ω\OmegaΩ , and 6.0 Ω\OmegaΩ and a 24-V emf device are all in series.The potential difference across the 2.0- Ω\OmegaΩ resistor is:

Four 20- Ω\OmegaΩ resistors are connected in parallel and the combination is connected to a 20-V emf device.The current in the device is:

If a circuit has L closed loops, B branches, and J junctions the number of independent loop equations is:

Resistances of 2.0 Ω\OmegaΩ , 4.0 Ω\OmegaΩ , and 6.0 Ω\OmegaΩ and a 24-V emf device are all in series.The circuit is initially ungrounded.After grounding, the current in the circuit:

Four 20- Ω\OmegaΩ resistors are connected in parallel and the combination is connected to a 20-V emf device.The current in any one of the resistors is:

A series circuit consists of a battery with internal resistance r and an external resistor R.If these two resistances are equal (r = R)then the energy dissipated per unit time by the internal resistance r is:

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

A battery has an emf of 9 V and an internal resistance of 2 Ω\OmegaΩ .If the potential difference across its terminals is greater than 9 V:

The time constant RC has units of:

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

A galvanometer has an internal resistance of 12 Ω\OmegaΩ and requires 0.01 A for full scale deflection.To convert it to a voltmeter reading 3 V full scale, one must use a series resistance of:

Here is a loop equation: .What does this equation represent?

A battery is connected across a series combination of two identical resistors.If the potential difference across the terminals is V and the current in the battery is i, then:

Resistor 1 has twice the resistance of resistor 2.They are connected in parallel to a battery.The ratio of the thermal energy dissipation by 1 to that by 2 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

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The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Electric Charge

Electric Fields

Gauss Law

Electric Potential

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Current and Resistance

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

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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

By using only two resistors, R₁ and R₂ a student is able to obtain resistances of 3 $\Omega$ , 4 $\Omega$ , 12 $\Omega$ , and 16 $\Omega$ .The values of R₁ and R₂ are:

Resistances of 2.0 $\Omega$ , 4.0 $\Omega$ , and 6.0 $\Omega$ and a 24-V emf device are all in series.The potential difference across the 2.0- $\Omega$ resistor is:

Four 20- $\Omega$ resistors are connected in parallel and the combination is connected to a 20-V emf device.The current in the device is:

Resistances of 2.0 $\Omega$ , 4.0 $\Omega$ , and 6.0 $\Omega$ and a 24-V emf device are all in series.The circuit is initially ungrounded.After grounding, the current in the circuit:

Four 20- $\Omega$ resistors are connected in parallel and the combination is connected to a 20-V emf device.The current in any one of the resistors is:

A battery has an emf of 9 V and an internal resistance of 2 $\Omega$ .If the potential difference across its terminals is greater than 9 V:

A galvanometer has an internal resistance of 12 $\Omega$ and requires 0.01 A for full scale deflection.To convert it to a voltmeter reading 3 V full scale, one must use a series resistance of: