Question 1

If I = 2.0 A in the circuit segment shown below,what is the potential difference VB -VA?

Accepted Answer

A) +10 V 
B) -20 V 
C) -10 V 
D) +20 V 
E) +30 V 
A) +10 V 
B) -20 V 
C) -10 V 
D) +20 V 
E) +30 V

Question 2

Determine R when I = 0.20 A and $\varepsilon$ = 18 V.

Accepted Answer

A) 50 $\Omega$ 
B) 8.0  $\Omega$ 
C) 10  $\Omega$ 
D) 20  $\Omega$ 
E) 30  $\Omega$ 
A) 50 $\Omega$ 
B) 8.0  $\Omega$ 
C) 10  $\Omega$ 
D) 20  $\Omega$ 
E) 30  $\Omega$

Question 3

What is the equivalent resistance between points A and B in the figure when R = 20$\Omega$?

Accepted Answer

A) 77 $\Omega$ 
B) 63 $\Omega$ 
C) 70 $\Omega$ 
D) 84$\Omega$ 
E) 140 $\Omega$ 
A) 77 $\Omega$ 
B) 63 $\Omega$ 
C) 70 $\Omega$ 
D) 84$\Omega$ 
E) 140 $\Omega$

Question 4

Determine the current in the 10-V emf.

Accepted Answer

A) 2.3 A 
B) 2.7 A 
C) 1.3 A 
D) 0.30 A 
E) 2.5 A 
A) 2.3 A 
B) 2.7 A 
C) 1.3 A 
D) 0.30 A 
E) 2.5 A

Question 5

A circuit consists of 2N resistors,all of resistance R,connected as shown below.A potential difference V is applied to one end,and the other end is at ground potential.The equivalent resistance of the circuit is

Accepted Answer

A)  $\frac { R } { 2 }$ . 
B) R. 
C)  $\frac { N R } { 2 }$ . 
D) NR. 
E) 2NR. 
A)  $\frac { R } { 2 }$ . 
B) R. 
C)  $\frac { N R } { 2 }$ . 
D) NR. 
E) 2NR.

Question 6

The circuit below contains three resistors,A,B,and C,which all have equal resistances.The emf $\varepsilon$ = 110V.Which resistor generates the most thermal energy after the switch is closed?

Accepted Answer

A) A 
B) B 
C) C 
D) A and B 
E) All three generate equal amounts of thermal energy. 
A) A 
B) B 
C) C 
D) A and B 
E) All three generate equal amounts of thermal energy.

Question 7

Determine the potential difference Va - Vb shown in the circuit below.

Accepted Answer

A) -5.0 V 
B) +5.0 V 
C) -10 V 
D) +10 V 
E) 0 V 
A) -5.0 V 
B) +5.0 V 
C) -10 V 
D) +10 V 
E) 0 V

Question 8

The battery is disconnected from a series RC circuit after the capacitor is fully charged and is replaced by an open switch.When the switch is closed,

Accepted Answer

A) the current through the resistor is always greater than the current through the capacitor. 
B) the current through the resistor is always less than the current through the capacitor. 
C) the current through the resistor is always equal to the current through the capacitor. 
D) the capacitor does not allow current to pass. 
E) the current stops in the resistor. 
A) the current through the resistor is always greater than the current through the capacitor. 
B) the current through the resistor is always less than the current through the capacitor. 
C) the current through the resistor is always equal to the current through the capacitor. 
D) the capacitor does not allow current to pass. 
E) the current stops in the resistor.

Question 9

What is the equivalent resistance between points a and b?

Accepted Answer

A) 14 $\Omega$ 
B) 8.0$\Omega$ 
C) 6.0$\Omega$ 
D) 25 $\Omega$ 
E) 40$\Omega$ 
A) 14 $\Omega$ 
B) 8.0$\Omega$ 
C) 6.0$\Omega$ 
D) 25 $\Omega$ 
E) 40$\Omega$

Question 10

If R = 3.0 k$\Omega$,C = 6.0 nF,$\varepsilon$ 1 = 10.0 V,Q = 18 nC,$\varepsilon$ 2 = 6.0 V,and I = 5.0 mA,what is the potential difference Vb - Va?

Accepted Answer

A) -13 V 
B) +28 V 
C) +13 V 
D) -28 V 
E) +2.0 V 
A) -13 V 
B) +28 V 
C) +13 V 
D) -28 V 
E) +2.0 V

Question 11

How much energy is dissipated as heat during a two-minute time interval by a 1.5-k$\Omega$ resistor which has a constant 20-V potential difference across its leads?

Accepted Answer

A) 58 J 
B) 46 J 
C) 32 J 
D) 72 J 
E) 16 J 
A) 58 J 
B) 46 J 
C) 32 J 
D) 72 J 
E) 16 J

Question 12

The circuit below contains three 100-W light bulbs and a capacitor.The emf $\varepsilon$ = 110V.At the instant the switch S is closed,which light bulb is brightest?

Accepted Answer

A) A 
B) B 
C) C 
D) A and B 
E) All three are equally bright. 
A) A 
B) B 
C) C 
D) A and B 
E) All three are equally bright.

Question 13

A conductor of radius r,length $\ell$ and resistivity $\rho$ has resistance R.What is the new resistance if it is stretched to 4 times its original length?

Accepted Answer

A)  $\frac { 1 } { 16 }$ R 
B)  $\frac { 1 } { 4 }$ R 
C) R 
D) 4R 
E) 16R 
A)  $\frac { 1 } { 16 }$ R 
B)  $\frac { 1 } { 4 }$ R 
C) R 
D) 4R 
E) 16R

Question 14

What is the equivalent resistance between points A and B in the figure when R = 18 $\Omega$?

Accepted Answer

A) 48 $\Omega$ 
B) 64 $\Omega$ 
C) 80 $\Omega$ 
D) 96 $\Omega$ 
E) 110 $\Omega$ 
A) 48 $\Omega$ 
B) 64 $\Omega$ 
C) 80 $\Omega$ 
D) 96 $\Omega$ 
E) 110 $\Omega$

Question 15

What is the potential difference VB - VA when the I = 1.5 A in the circuit segment below?

Accepted Answer

A) +22 V 
B) -22 V 
C) -38 V 
D) +38 V 
E) +2.0 V 
A) +22 V 
B) -22 V 
C) -38 V 
D) +38 V 
E) +2.0 V

Question 16

Determine the potential difference,VA - VB,in the circuit segment shown below when I = 2.0 mA and Q = 50 $\mu$C.

Accepted Answer

A) -40 V 
B) +40 V 
C) +20 V 
D) -20 V 
E) -10 V 
A) -40 V 
B) +40 V 
C) +20 V 
D) -20 V 
E) -10 V

Question 17

A certain brand of hot dog cooker applies a potential difference (120 V)to opposite ends of the hot dog and cooks by means of the joule heat produced.If 60 kJ is needed to cook each hot dog,what current is needed to cook four hot dogs simultaneously in 3.0 min?

Accepted Answer

A) 11 A 
B) 2.8 A 
C) 8.3 A 
D) 2.1 A 
E) 3.6 A 
A) 11 A 
B) 2.8 A 
C) 8.3 A 
D) 2.1 A 
E) 3.6 A

Question 18

The circuit below shows three resistors in series.R3 > R2 > R1.The resistors are all made of the same wire with the same diameter but have different lengths.Rank the magnitudes of the electric fields in the resistors from least to greatest.

Accepted Answer

A) E3 2 1. 
B) E2 1 = E3. 
C) E1 = E2 = E3. 
D) E1 = E3 2. 
E) E1 2 3. 
A) E3 2 1. 
B) E2 1 = E3. 
C) E1 = E2 = E3. 
D) E1 = E3 2. 
E) E1 2 3.

Question 19

What is the magnitude of the current in the 20- $\Omega$  resistor?

Accepted Answer

A) 0.75 A 
B) 0.00 A 
C) 0.25 A 
D) 0.50 A 
E) 1.00 A 
A) 0.75 A 
B) 0.00 A 
C) 0.25 A 
D) 0.50 A 
E) 1.00 A

Question 20

A circuit consists of N resistors,all of resistance R,connected as shown below.A potential difference V is applied to the circuit.The equivalent resistance of the circuit is

Accepted Answer

A)  $\frac { R } { 2 N }$ . 
B)  $\frac { R } { N }$ . 
C) R. 
D) NR. 
E) 2NR. 
A)  $\frac { R } { 2 N }$ . 
B)  $\frac { R } { N }$ . 
C) R. 
D) NR. 
E) 2NR.

Exam 21: Current and Direct Current Circuits

If I = 2.0 A in the circuit segment shown below,what is the potential difference VB -VA?

Determine R when I = 0.20 A and ε\varepsilonε = 18 V.

What is the equivalent resistance between points A and B in the figure when R = 20 Ω\OmegaΩ ?

Determine the current in the 10-V emf.

A circuit consists of 2N resistors,all of resistance R,connected as shown below.A potential difference V is applied to one end,and the other end is at ground potential.The equivalent resistance of the circuit is

The circuit below contains three resistors,A,B,and C,which all have equal resistances.The emf ε\varepsilonε = 110V.Which resistor generates the most thermal energy after the switch is closed?

Determine the potential difference Va - Vb shown in the circuit below.

The battery is disconnected from a series RC circuit after the capacitor is fully charged and is replaced by an open switch.When the switch is closed,

What is the equivalent resistance between points a and b?

If R = 3.0 k Ω\OmegaΩ ,C = 6.0 nF, ε\varepsilonε 1 = 10.0 V,Q = 18 nC, ε\varepsilonε 2 = 6.0 V,and I = 5.0 mA,what is the potential difference Vb - Va?

How much energy is dissipated as heat during a two-minute time interval by a 1.5-k Ω\OmegaΩ resistor which has a constant 20-V potential difference across its leads?

The circuit below contains three 100-W light bulbs and a capacitor.The emf ε\varepsilonε = 110V.At the instant the switch S is closed,which light bulb is brightest?

A conductor of radius r,length ℓ\ellℓ and resistivity ρ\rhoρ has resistance R.What is the new resistance if it is stretched to 4 times its original length?

What is the equivalent resistance between points A and B in the figure when R = 18 Ω\OmegaΩ ?

What is the potential difference VB - VA when the I = 1.5 A in the circuit segment below?

Determine the potential difference,VA - VB,in the circuit segment shown below when I = 2.0 mA and Q = 50 μ\muμ C.

A certain brand of hot dog cooker applies a potential difference (120 V)to opposite ends of the hot dog and cooks by means of the joule heat produced.If 60 kJ is needed to cook each hot dog,what current is needed to cook four hot dogs simultaneously in 3.0 min?

The circuit below shows three resistors in series.R3 > R2 > R1.The resistors are all made of the same wire with the same diameter but have different lengths.Rank the magnitudes of the electric fields in the resistors from least to greatest.

What is the magnitude of the current in the 20- Ω\OmegaΩ resistor?

A circuit consists of N resistors,all of resistance R,connected as shown below.A potential difference V is applied to the circuit.The equivalent resistance of the circuit is

Introduction and Vectors

Motion in One Dimension

Motion in Two Dimensions

The Laws of Motion

More Applications of Newtons Laws

Energy of a System

Conservation of Energy

Momentum and Collisions

Relativity

Rotational Motion

Gravity,planetary Orbits,and the Hydrogen Atom

Oscillatory Motion

Mechanical Waves

Superposition and Standing Waves

Fluid Mechanics

Temperature and the Kinetic Theory of Gases

Energy in Thermal Processes: the First Law of Thermodynamics

Heat Engines,entropy,and the Second Law of Thermodynamics

Electric Forces and Electric Fields

Electric Potential and Capacitance

Magnetic Forces and Magnetic Fields

Faradays Law and Inductance

Electromagnetic Waves

Reflection and Refraction of Light

Image Formation by Mirrors and Lenses

Wave Optics

Quantum Physics

Atomic Physics

Nuclear Physics

Particle Physics

Filters

If I = 2.0 A in the circuit segment shown below,what is the potential difference V_B -V_A?

Determine R when I = 0.20 A and $\varepsilon$ = 18 V. $Determine R when I = 0.20 A and \varepsilon = 18 V.$

What is the equivalent resistance between points A and B in the figure when R = 20 $\Omega$ ? $What is the equivalent resistance between points A and B in the figure when R = 20 \Omega ?$

Determine the potential difference V_a - V_b shown in the circuit below.

How much energy is dissipated as heat during a two-minute time interval by a 1.5-k $\Omega$ resistor which has a constant 20-V potential difference across its leads?

A conductor of radius r,length $\ell$ and resistivity $\rho$ has resistance R.What is the new resistance if it is stretched to 4 times its original length?

What is the equivalent resistance between points A and B in the figure when R = 18 $\Omega$ ? $What is the equivalent resistance between points A and B in the figure when R = 18 \Omega ?$

What is the potential difference V_B - V_A when the I = 1.5 A in the circuit segment below?

Determine the potential difference,V_A - V_B,in the circuit segment shown below when I = 2.0 mA and Q = 50 $\mu$ C. $Determine the potential difference,V<sub>A</sub> - V<sub>B</sub>,in the circuit segment shown below when I = 2.0 mA and Q = 50 \mu C.$

The circuit below shows three resistors in series.R₃ > R₂ > R₁.The resistors are all made of the same wire with the same diameter but have different lengths.Rank the magnitudes of the electric fields in the resistors from least to greatest.

What is the magnitude of the current in the 20- $\Omega$ resistor? $What is the magnitude of the current in the 20- \Omega resistor?$