Question 1

What is the current in the 15-$\Omega$ resistor when $\varepsilon$ = 9.0 V?

Accepted Answer

A) 0.20 A 
B) 0.30 A 
C) 0.10 A 
D) 0.26 A 
E) 0.60 A 
A) 0.20 A 
B) 0.30 A 
C) 0.10 A 
D) 0.26 A 
E) 0.60 A

Question 2

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 < E2 < E1. 
B) E2 < E1 = E3. 
C) E1 = E2 = E3. 
D) E1 = E3 < E2. 
E) E1 < E2 < E3. 
A) E3 < E2 < E1. 
B) E2 < E1 = E3. 
C) E1 = E2 = E3. 
D) E1 = E3 < E2. 
E) E1 < E2 < E3.

Question 3

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 4

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 5

In an RC circuit, how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference?

Accepted Answer

A) 2.2 
B) 1.9 
C) 1.6 
D) 3.0 
E) 5.0 
A) 2.2 
B) 1.9 
C) 1.6 
D) 3.0 
E) 5.0

Question 6

How much heat is produced in the 10- $\Omega$resistor in 5.0 s when $\varepsilon$ = 18 V?

Accepted Answer

A) 72 J 
B) 32 J 
C) 50 J 
D) 18 J 
E) 90 J 
A) 72 J 
B) 32 J 
C) 50 J 
D) 18 J 
E) 90 J

Question 7

The circuit below contains three 100-watt light bulbs.The emf $\varepsilon$ = 110 V.Which light bulb(s) is(are) the 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 8

At t = 0 the switch S is closed with the capacitor uncharged.If C = 40 $\mu$F, $\varepsilon$ = 50 V, and R = 5.0 k$\Omega$, how much energy is stored by the capacitor when I = 2.0 mA?

Accepted Answer

A) 20 mJ 
B) 28 mJ 
C) 32 mJ 
D) 36 mJ 
E) 40 mJ 
A) 20 mJ 
B) 28 mJ 
C) 32 mJ 
D) 36 mJ 
E) 40 mJ

Question 9

The circuit below contains 5 identical light bulbs.The emf is 110 V.Which light bulb(s) is(are) brightest?

Accepted Answer

A) A: The one closest to the positive terminal of the battery. 
B) A and C: The bulbs closest to the positive terminal of the battery. 
C) A and B: Because they are closest to the terminals of the battery. 
D) C and D: Because they receive current from A and B and from E. 
E) E: Because the potential difference across E is that of the battery. 
A) A: The one closest to the positive terminal of the battery. 
B) A and C: The bulbs closest to the positive terminal of the battery. 
C) A and B: Because they are closest to the terminals of the battery. 
D) C and D: Because they receive current from A and B and from E. 
E) E: Because the potential difference across E is that of the battery.

Question 10

The circuit below shows three resistors in parallel.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 < E2 < E1. 
B) E2 < E1 = E3. 
C) E1 = E2 = E3. 
D) E1 = E3 < E2. 
E) E1 < E2 < E3. 
A) E3 < E2 < E1. 
B) E2 < E1 = E3. 
C) E1 = E2 = E3. 
D) E1 = E3 < E2. 
E) E1 < E2 < E3.

Question 11

The diagram shown represents a portion of a wire in a circuit.A current is flowing in the wire in the direction shown.Under the convention that it is positive charge that flows the electric field points in the direction of the current.How can the electric field change direction where the wire bends?

Accepted Answer

A) There is an excess of negative charge in the centre of the wire. 
B) There is an excess of positive charge at the bottom end of the wire. 
C) There is an excess of negative charge at the right end of the upper portion of the wire. 
D) There is an accumulation of positive charge on the surface, particularly at the bend, such that the sum of electric fields gives the new electric field. 
E) There is an accumulation of electrical potential as the current traverses the wire.The higher potential in the lower half is the source of the field. 
A) There is an excess of negative charge in the centre of the wire. 
B) There is an excess of positive charge at the bottom end of the wire. 
C) There is an excess of negative charge at the right end of the upper portion of the wire. 
D) There is an accumulation of positive charge on the surface, particularly at the bend, such that the sum of electric fields gives the new electric field. 
E) There is an accumulation of electrical potential as the current traverses the wire.The higher potential in the lower half is the source of the field.

Question 12

Which of the identical light bulb(s) is(are) brightest when the capacitor has half its maximum charge?

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 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 14

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)    
B) R. 
C)    
D) NR. 
E) 2NR. 
A)    
B) R. 
C)    
D) NR. 
E) 2NR.

Question 15

How long will it take a charged 80-$\mu$F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45-$\Omega$resistor?

Accepted Answer

A) 0.92 ms 
B) 0.64 ms 
C) 0.40 ms 
D) 0.19 ms 
E) 0.80 ms 
A) 0.92 ms 
B) 0.64 ms 
C) 0.40 ms 
D) 0.19 ms 
E) 0.80 ms

Question 16

When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors.When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A.What is the magnitude of the greater of the two resistances?

Accepted Answer

A) 7.2 $\Omega$ 
B) 7.6 $\Omega$ 
C) 6.9 $\Omega$ 
D) 8.0$\Omega$ 
E) 2.8 $\Omega$ 
A) 7.2 $\Omega$ 
B) 7.6 $\Omega$ 
C) 6.9 $\Omega$ 
D) 8.0$\Omega$ 
E) 2.8 $\Omega$

Question 17

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 18

A 5000- $\Omega$ resistor and a 50-$\mu$F capacitor are connected in series at t = 0 with a 6-V battery.The capacitor is initially uncharged.What is the current in the circuit at t = 0? At t = 0.5 s? What is the maximum charge stored on the capacitor?

Accepted Answer

1.2 mA, 0.

Question 19

If R1 = 3.0 $\Omega$, R2 = 6.0 $\Omega$, R3 = 12 $\Omega$, and I = 0.50 A, at what rate is heat being generated in R1?

Accepted Answer

A) 20 W 
B) 17 W 
C) 12 W 
D) 31 W 
E) 6.0 W 
A) 20 W 
B) 17 W 
C) 12 W 
D) 31 W 
E) 6.0 W

Question 20

If Q = 400 $\mu$C and the potential difference VA - VB =-V in the circuit segment shown below, what is the current in the resistor?

Accepted Answer

A) 1.0 mA right to left 
B) 1.0 mA left to right 
C) 3.5 mA right to left 
D) 3.5 mA left to right 
E) None of the above 
A) 1.0 mA right to left 
B) 1.0 mA left to right 
C) 3.5 mA right to left 
D) 3.5 mA left to right 
E) None of the above

What is the current in the 15- $\Omega$ resistor when $\varepsilon$ = 9.0 V? $What is the current in the 15- \Omega resistor when \varepsilon = 9.0 V?$

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

In an RC circuit, how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference?

How much heat is produced in the 10- $\Omega$ resistor in 5.0 s when $\varepsilon$ = 18 V? $How much heat is produced in the 10- \Omega resistor in 5.0 s when \varepsilon = 18 V?$

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

The circuit below contains 5 identical light bulbs.The emf is 110 V.Which light bulb(s) is(are) brightest?

The circuit below shows three resistors in parallel.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.

The diagram shown represents a portion of a wire in a circuit.A current is flowing in the wire in the direction shown.Under the convention that it is positive charge that flows the electric field points in the direction of the current.How can the electric field change direction where the wire bends?

Which of the identical light bulb(s) is(are) brightest when the capacitor has half its maximum charge?

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?

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:

How long will it take a charged 80- $\mu$ F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45- $\Omega$ resistor?

When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors.When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A.What is the magnitude of the greater of the two resistances?

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

A 5000- $\Omega$ resistor and a 50- $\mu$ F capacitor are connected in series at t = 0 with a 6-V battery.The capacitor is initially uncharged.What is the current in the circuit at t = 0? At t = 0.5 s? What is the maximum charge stored on the capacitor?

If R1 = 3.0 $\Omega$ , R2 = 6.0 $\Omega$ , R3 = 12 $\Omega$ , and I = 0.50 A, at what rate is heat being generated in R1? $If R1 = 3.0 \Omega , R2 = 6.0 \Omega , R3 = 12 \Omega , and I = 0.50 A, at what rate is heat being generated in R1?$

If Q = 400 $\mu$ C and the potential difference VA - VB =-V in the circuit segment shown below, what is the current in the resistor? $If Q = 400 \mu C and the potential difference VA - VB =-V in the circuit segment shown below, what is the current in the resistor?$

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

What is the current in the 15- Ω\OmegaΩ resistor when ε\varepsilonε = 9.0 V?

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.

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?

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

In an RC circuit, how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference?

How much heat is produced in the 10- Ω\OmegaΩ resistor in 5.0 s when ε\varepsilonε = 18 V?

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

At t = 0 the switch S is closed with the capacitor uncharged.If C = 40 μ\muμ F, ε\varepsilonε = 50 V, and R = 5.0 k Ω\OmegaΩ , how much energy is stored by the capacitor when I = 2.0 mA?

The circuit below contains 5 identical light bulbs.The emf is 110 V.Which light bulb(s) is(are) brightest?

The circuit below shows three resistors in parallel.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.

Which of the identical light bulb(s) is(are) brightest when the capacitor has half its maximum charge?

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?

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:

How long will it take a charged 80- μ\muμ F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45- Ω\OmegaΩ resistor?

When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors.When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A.What is the magnitude of the greater of the two resistances?

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

A 5000- Ω\OmegaΩ resistor and a 50- μ\muμ F capacitor are connected in series at t = 0 with a 6-V battery.The capacitor is initially uncharged.What is the current in the circuit at t = 0? At t = 0.5 s? What is the maximum charge stored on the capacitor?

If R1 = 3.0 Ω\OmegaΩ , R2 = 6.0 Ω\OmegaΩ , R3 = 12 Ω\OmegaΩ , and I = 0.50 A, at what rate is heat being generated in R1?

If Q = 400 μ\muμ C and the potential difference VA - VB =-V in the circuit segment shown below, what is the current in the resistor?

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

What is the current in the 15- $\Omega$ resistor when $\varepsilon$ = 9.0 V? $What is the current in the 15- \Omega resistor when \varepsilon = 9.0 V?$

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

How much heat is produced in the 10- $\Omega$ resistor in 5.0 s when $\varepsilon$ = 18 V? $How much heat is produced in the 10- \Omega resistor in 5.0 s when \varepsilon = 18 V?$

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

How long will it take a charged 80- $\mu$ F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45- $\Omega$ resistor?

A 5000- $\Omega$ resistor and a 50- $\mu$ F capacitor are connected in series at t = 0 with a 6-V battery.The capacitor is initially uncharged.What is the current in the circuit at t = 0? At t = 0.5 s? What is the maximum charge stored on the capacitor?

If R1 = 3.0 $\Omega$ , R2 = 6.0 $\Omega$ , R3 = 12 $\Omega$ , and I = 0.50 A, at what rate is heat being generated in R1? $If R1 = 3.0 \Omega , R2 = 6.0 \Omega , R3 = 12 \Omega , and I = 0.50 A, at what rate is heat being generated in R1?$

If Q = 400 $\mu$ C and the potential difference VA - VB =-V in the circuit segment shown below, what is the current in the resistor? $If Q = 400 \mu C and the potential difference VA - VB =-V in the circuit segment shown below, what is the current in the resistor?$