Question 1

The circuit below contains 4 100-W light bulbs.The emf is 110 V.Which light bulb(s) is(are) brightest?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) C and D 
A) A 
B) B 
C) C 
D) D 
E) C and D B

Question 2

If the current in the 4.0- $\Omega$resistor is 1.4 A, what is the magnitude of the potential difference, VA -VB?

Accepted Answer

A) 69 V 
B) 55 V 
C) 62 V 
D) 48 V 
E) 31 V 
A) 69 V 
B) 55 V 
C) 62 V 
D) 48 V 
E) 31 V D

Question 3

A battery has an internal resistance of 4.0  $\Omega$ .Which of the following load resistors would have the most power delivered to it when connected across the battery?

Accepted Answer

A) 1.4  $\Omega$ 
B) 2.0  $\Omega$ 
C) 4.0  $\Omega$ 
D) 8.0  $\Omega$ 
E) 16 $\Omega$ 
A) 1.4  $\Omega$ 
B) 2.0  $\Omega$ 
C) 4.0  $\Omega$ 
D) 8.0  $\Omega$ 
E) 16 $\Omega$ C

Question 4

What is the equivalent resistance between points a and b when R = 30 $\Omega$?

Accepted Answer

A) 27 $\Omega$ 
B) 21 $\Omega$ 
C) 24 $\Omega$ 
D) 18 $\Omega$ 
E) 7.5 $\Omega$ 
A) 27 $\Omega$ 
B) 21 $\Omega$ 
C) 24 $\Omega$ 
D) 18 $\Omega$ 
E) 7.5 $\Omega$

Question 5

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 6

The circuit below contains three 100-watt light bulbs and a capacitor.The emf $\varepsilon$ = 110V.The capacitor is fully charged.Which light bulb(s) is(are) dimmest?

Accepted Answer

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

Question 7

What is the maximum number of 100-W light bulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?

Accepted Answer

The answer of What is the maximum number of 100-W...

Question 8

At what rate is thermal energy being generated in the 2R-resistor when $\varepsilon$= 12 V and R = 3.0 $\Omega$ ?

Accepted Answer

A) 12 W 
B) 24 W 
C) 6.0 W 
D) 3.0 W 
E) 1.5 W 
A) 12 W 
B) 24 W 
C) 6.0 W 
D) 3.0 W 
E) 1.5 W

Question 9

What is the current in the 10-$\Omega$ resistor ?

Accepted Answer

A) 0.60 A 
B) 3.0 A 
C) 1.2 A 
D) 2.4 A 
E) 0.30 A 
A) 0.60 A 
B) 3.0 A 
C) 1.2 A 
D) 2.4 A 
E) 0.30 A

Question 10

If R1 = 10 $\Omega$, R2 = 15 $\Omega$, R3 = 20 $\Omega$, and I = 0.50 A, at what rate is heat being generated in these resistors?

Accepted Answer

A) 29 W 
B) 16 W 
C) 22 W 
D) 11 W 
E) 1.1 W 
A) 29 W 
B) 16 W 
C) 22 W 
D) 11 W 
E) 1.1 W

Question 11

The circuit below contains three 100-W light bulbs.The emf $\varepsilon$= 110 V.Which light bulb(s) is(are) brightest?

Accepted Answer

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

Question 12

Determine the resistance R when I = 1.5 A.

Accepted Answer

A) 40  $\Omega$ 
B) 8.0  $\Omega$ 
C) 85  $\Omega$ 
D) 28 $\Omega$ 
E) 32 $\Omega$ 
A) 40  $\Omega$ 
B) 8.0  $\Omega$ 
C) 85  $\Omega$ 
D) 28 $\Omega$ 
E) 32 $\Omega$

Question 13

A series circuit consists of a 100 V DC power source, a 100  $\Omega$  resistor, and a variable resistor of resistance R, which varies from 0 to 100  $\Omega$ .The current in the circuit is:

Accepted Answer

A) directly proportional to R. 
B) inversely proportional to R. 
C) directly proportional to (100  $\Omega$  + R). 
D) inversely proportional to (100  $\Omega$  + R). 
E) neither directly nor inversely proportional to R or to (100  $\Omega$ + R). 
A) directly proportional to R. 
B) inversely proportional to R. 
C) directly proportional to (100  $\Omega$  + R). 
D) inversely proportional to (100  $\Omega$  + R). 
E) neither directly nor inversely proportional to R or to (100  $\Omega$ + R).

Question 14

When a capacitor is fully charged, the current through the capacitor in a direct-current circuit is:

Accepted Answer

A) zero. 
B) at its maximum value. 
C) equal to the current in a resistive circuit in parallel with the capacitor circuit. 
D) greater than the current in a resistor that is farther from the battery than the capacitor. 
E) zero if it is the only capacitor, but maximum if there is another capacitor in series with it. 
A) zero. 
B) at its maximum value. 
C) equal to the current in a resistive circuit in parallel with the capacitor circuit. 
D) greater than the current in a resistor that is farther from the battery than the capacitor. 
E) zero if it is the only capacitor, but maximum if there is another capacitor in series with it.

Question 15

A parallel circuit consists of a 100 V DC power source, a 100  $\Omega$ resistor, and a variable resistor of resistance R, which varies from 0 to 100  $\Omega$ .The current in the circuit is:

Accepted Answer

A) directly proportional to R. 
B) inversely proportional to R. 
C) directly proportional to (100 $\Omega$  + R). 
D) inversely proportional to (100  $\Omega$ + R). 
E) neither directly nor inversely proportional to R or to (100  $\Omega$  + R). 
A) directly proportional to R. 
B) inversely proportional to R. 
C) directly proportional to (100 $\Omega$  + R). 
D) inversely proportional to (100  $\Omega$ + R). 
E) neither directly nor inversely proportional to R or to (100  $\Omega$  + R).

Question 16

What is the magnitude of the potential difference across the 20-$\Omega$ resistor?

Accepted Answer

A) 3.2 V 
B) 7.8 V 
C) 11 V 
D) 5.0 V 
E) 8.6 V 
A) 3.2 V 
B) 7.8 V 
C) 11 V 
D) 5.0 V 
E) 8.6 V

Question 17

If $\varepsilon$ 1 = 4.0 V, $\varepsilon$2 = 12.0 V, R1 = 4 $\Omega$, R2 = 12  $\Omega$, C = 3 $\mu$F, Q = 18 $\mu$C, and I = 2.5 A, what is the potential difference Va-Vb?

Accepted Answer

A) (-30 V) 
B) 30 V 
C) 5.0 V 
D) (-5.0 V) 
E) (-1.0 V) 
A) (-30 V) 
B) 30 V 
C) 5.0 V 
D) (-5.0 V) 
E) (-1.0 V)

Question 18

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 19

At t = 0 the switch S is closed with the capacitor uncharged.If C = 50 $\mu$ F, $\varepsilon$= 20 V, and R = 4.0 k $\Omega$, what is the charge on the capacitor when I = 2.0 mA?

Accepted Answer

A) 360 $\mu$C 
B) 480 $\mu$C 
C) 240 $\mu$C 
D) 600 $\mu$C 
E) 400 $\mu$C 
A) 360 $\mu$C 
B) 480 $\mu$C 
C) 240 $\mu$C 
D) 600 $\mu$C 
E) 400 $\mu$C

Question 20

What is the equivalent resistance between points a and b when R = 13$\Omega$?

Accepted Answer

A) 29 $\Omega$ 
B) 23 $\Omega$ 
C) 26 $\Omega$ 
D) 20 $\Omega$ 
E) 4.6 $\Omega$ 
A) 29 $\Omega$ 
B) 23 $\Omega$ 
C) 26 $\Omega$ 
D) 20 $\Omega$ 
E) 4.6 $\Omega$

The circuit below contains 4 100-W light bulbs.The emf is 110 V.Which light bulb(s) is(are) brightest?

If the current in the 4.0- $\Omega$ resistor is 1.4 A, what is the magnitude of the potential difference, VA -VB? $If the current in the 4.0- \Omega resistor is 1.4 A, what is the magnitude of the potential difference, VA -VB?$

A battery has an internal resistance of 4.0 $\Omega$ .Which of the following load resistors would have the most power delivered to it when connected across the battery?

What is the equivalent resistance between points a and b when R = 30 $\Omega$ ? $What is the equivalent resistance between points a and b when R = 30 \Omega ?$

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 maximum number of 100-W light bulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?

At what rate is thermal energy being generated in the 2R-resistor when $\varepsilon$ = 12 V and R = 3.0 $\Omega$ ? $At what rate is thermal energy being generated in the 2R-resistor when \varepsilon = 12 V and R = 3.0 \Omega ?$

What is the current in the 10- $\Omega$ resistor ? $What is the current in the 10- \Omega resistor ?$

If R1 = 10 $\Omega$ , R2 = 15 $\Omega$ , R3 = 20 $\Omega$ , and I = 0.50 A, at what rate is heat being generated in these resistors? $If R1 = 10 \Omega , R2 = 15 \Omega , R3 = 20 \Omega , and I = 0.50 A, at what rate is heat being generated in these resistors?$

The circuit below contains three 100-W light bulbs.The emf $\varepsilon$ = 110 V.Which light bulb(s) is(are) brightest? $The circuit below contains three 100-W light bulbs.The emf \varepsilon = 110 V.Which light bulb(s) is(are) brightest?$

Determine the resistance R when I = 1.5 A.

When a capacitor is fully charged, the current through the capacitor in a direct-current circuit is:

What is the magnitude of the potential difference across the 20- $\Omega$ resistor? $What is the magnitude of the potential difference across the 20- \Omega resistor?$

What is the equivalent resistance between points a and b when R = 13 $\Omega$ ? $What is the equivalent resistance between points a and b when R = 13 \Omega ?$

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Quantum Physics of Molecules and Solids

Nuclei and Radioactivity

Particle Physics

Filters

Exam 6: Direct-Current Circuits

The circuit below contains 4 100-W light bulbs.The emf is 110 V.Which light bulb(s) is(are) brightest?

If the current in the 4.0- Ω\OmegaΩ resistor is 1.4 A, what is the magnitude of the potential difference, VA -VB?

A battery has an internal resistance of 4.0 Ω\OmegaΩ .Which of the following load resistors would have the most power delivered to it when connected across the battery?

What is the equivalent resistance between points a and b when R = 30 Ω\OmegaΩ ?

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

The circuit below contains three 100-watt light bulbs and a capacitor.The emf ε\varepsilonε = 110V.The capacitor is fully charged.Which light bulb(s) is(are) dimmest?

What is the maximum number of 100-W light bulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?

At what rate is thermal energy being generated in the 2R-resistor when ε\varepsilonε = 12 V and R = 3.0 Ω\OmegaΩ ?

What is the current in the 10- Ω\OmegaΩ resistor ?

If R1 = 10 Ω\OmegaΩ , R2 = 15 Ω\OmegaΩ , R3 = 20 Ω\OmegaΩ , and I = 0.50 A, at what rate is heat being generated in these resistors?

The circuit below contains three 100-W light bulbs.The emf ε\varepsilonε = 110 V.Which light bulb(s) is(are) brightest?

Determine the resistance R when I = 1.5 A.

A series circuit consists of a 100 V DC power source, a 100 Ω\OmegaΩ resistor, and a variable resistor of resistance R, which varies from 0 to 100 Ω\OmegaΩ .The current in the circuit is:

When a capacitor is fully charged, the current through the capacitor in a direct-current circuit is:

A parallel circuit consists of a 100 V DC power source, a 100 Ω\OmegaΩ resistor, and a variable resistor of resistance R, which varies from 0 to 100 Ω\OmegaΩ .The current in the circuit is:

What is the magnitude of the potential difference across the 20- Ω\OmegaΩ resistor?

If ε\varepsilonε 1 = 4.0 V, ε\varepsilonε 2 = 12.0 V, R1 = 4 Ω\OmegaΩ , R2 = 12 Ω\OmegaΩ , C = 3 μ\muμ F, Q = 18 μ\muμ C, and I = 2.5 A, what is the potential difference Va-Vb?

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?

At t = 0 the switch S is closed with the capacitor uncharged.If C = 50 μ\muμ F, ε\varepsilonε = 20 V, and R = 4.0 k Ω\OmegaΩ , what is the charge on the capacitor when I = 2.0 mA?

What is the equivalent resistance between points a and b when R = 13 Ω\OmegaΩ ?

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Quantum Physics of Molecules and Solids

Nuclei and Radioactivity

Particle Physics

Filters

If the current in the 4.0- $\Omega$ resistor is 1.4 A, what is the magnitude of the potential difference, VA -VB? $If the current in the 4.0- \Omega resistor is 1.4 A, what is the magnitude of the potential difference, VA -VB?$

A battery has an internal resistance of 4.0 $\Omega$ .Which of the following load resistors would have the most power delivered to it when connected across the battery?

What is the equivalent resistance between points a and b when R = 30 $\Omega$ ? $What is the equivalent resistance between points a and b when R = 30 \Omega ?$

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

At what rate is thermal energy being generated in the 2R-resistor when $\varepsilon$ = 12 V and R = 3.0 $\Omega$ ? $At what rate is thermal energy being generated in the 2R-resistor when \varepsilon = 12 V and R = 3.0 \Omega ?$

What is the current in the 10- $\Omega$ resistor ? $What is the current in the 10- \Omega resistor ?$

If R1 = 10 $\Omega$ , R2 = 15 $\Omega$ , R3 = 20 $\Omega$ , and I = 0.50 A, at what rate is heat being generated in these resistors? $If R1 = 10 \Omega , R2 = 15 \Omega , R3 = 20 \Omega , and I = 0.50 A, at what rate is heat being generated in these resistors?$

The circuit below contains three 100-W light bulbs.The emf $\varepsilon$ = 110 V.Which light bulb(s) is(are) brightest? $The circuit below contains three 100-W light bulbs.The emf \varepsilon = 110 V.Which light bulb(s) is(are) brightest?$

What is the magnitude of the potential difference across the 20- $\Omega$ resistor? $What is the magnitude of the potential difference across the 20- \Omega resistor?$

What is the equivalent resistance between points a and b when R = 13 $\Omega$ ? $What is the equivalent resistance between points a and b when R = 13 \Omega ?$