Question 1

At what rate is power supplied by the 10-V emf shown below?

Accepted Answer

A) -10 W 
B) +10 W 
C) zero 
D) +20 W 
E) -20 W 
A) -10 W 
B) +10 W 
C) zero 
D) +20 W 
E) -20 W B

Question 2

The circuit below contains three 100-W light bulbs and a capacitor.The emf is 110 V and the capacitor is fully charged.Which light bulb(s)is(are)brightest?

Accepted Answer

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

Question 3

If R = 4.0 k$\Omega$,C = 3.0 mF,$\varepsilon$ = 15 V,Q = 12 mC,and I = 2.0 mA,what is the potential difference Vb- Va?

Accepted Answer

A) +3.0 V 
B) -19 V 
C) -3.0 V 
D) +27 V 
E) +21 V 
A) +3.0 V 
B) -19 V 
C) -3.0 V 
D) +27 V 
E) +21 V C

Question 4

The capacitors are completely discharged in the circuit shown below.   The two resistors have the same resistance R and the two capacitors have the same capacitance C.After the switch is closed,the current

Accepted Answer

A) is greatest in C1. 
B) is greatest in C2. 
C) is greatest in R1. 
D) is greatest in R2. 
E) is the same in C1,C2,R1 and R2. 
A) is greatest in C1. 
B) is greatest in C2. 
C) is greatest in R1. 
D) is greatest in R2. 
E) is the same in C1,C2,R1 and R2.

Question 5

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 6

At what rate is thermal energy generated in the 5- $\Omega$ resistor when$\varepsilon$ = 24 V?

Accepted Answer

A) 13 W 
B) 3.2 W 
C) 23 W 
D) 39 W 
E) 51 W 
A) 13 W 
B) 3.2 W 
C) 23 W 
D) 39 W 
E) 51 W

Question 7

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

Question 8

In an RC circuit,what fraction of the final energy is stored in an initially uncharged capacitor after it has been charging for 3.0 time constants?

Accepted Answer

A) 0.84 
B) 0.90 
C) 0.75 
D) 0.60 
E) 0.03 
A) 0.84 
B) 0.90 
C) 0.75 
D) 0.60 
E) 0.03

Question 9

A wire (length = 2.0 m,diameter = 1.0 mm)has a resistance of 0.45$\Omega$.What is the resistivity of the material used to make the wire?

Accepted Answer

A) 5.6*10- 7 $\Omega$ . m 
B) 1.2 *10 - 7 $\Omega$. m 
C) 1.8*10 - 7 $\Omega$ . m 
D) 2.3 *10- 7 $\Omega$ . m 
E) 7.1* 10 - 7 $\Omega$ . m 
A) 5.6*10- 7 $\Omega$ . m 
B) 1.2 *10 - 7 $\Omega$. m 
C) 1.8*10 - 7 $\Omega$ . m 
D) 2.3 *10- 7 $\Omega$ . m 
E) 7.1* 10 - 7 $\Omega$ . m

Question 10

If Q = 400$\mu$C and the potential difference VA - VB = -10 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

Question 11

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 12

The circuit below contains 3 100-W light bulbs and a capacitor.The emf is 110 V.Which light bulb(s)is(are)brightest? (Assume the capacitor is fully charged. )

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

If 480 C pass through a 4.0-$\Omega$resistor in 10 min,what is the potential difference across the resistor?

Accepted Answer

A) 3.6 V 
B) 2.8 V 
C) 2.4 V 
D) 3.2 V 
E) 5.0 V 
A) 3.6 V 
B) 2.8 V 
C) 2.4 V 
D) 3.2 V 
E) 5.0 V

Question 14

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 center 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 center 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 15

A cook plugs a 500 W crockpot and a 1 000 W kettle into a 240 V power supply,all operating on direct current.When we compare the two,we find that

Accepted Answer

A) Icrockpot kettle and Rcrockpot kettle. 
B) Icrockpot kettle and Rcrockpot > Rkettle. 
C) Icrockpot = Ikettle and Rcrockpot = Rkettle. 
D) Icrockpot > Ikettle and Rcrockpot kettle. 
E) Icrockpot > Ikettle and Rcrockpot > Rkettle. 
A) Icrockpot kettle and Rcrockpot kettle. 
B) Icrockpot kettle and Rcrockpot > Rkettle. 
C) Icrockpot = Ikettle and Rcrockpot = Rkettle. 
D) Icrockpot > Ikettle and Rcrockpot kettle. 
E) Icrockpot > Ikettle and Rcrockpot > Rkettle.

Question 16

A copper cable is to be designed to carry a current of 300 A with a power loss of only 2.0 watts per meter.What is the required radius of the copper cable? (The resistivity of copper is 1.7 * 10 - 8 $\Omega$ . m. )

Accepted Answer

The answer of A copper cable is to be designed...

Question 17

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 18

What maximum power can be generated from an 18-V emf using any combination of a 6.0- $\Omega$ resistor and a 9.0- $\Omega$  resistor?

Accepted Answer

A) 54 W 
B) 71 W 
C) 90 W 
D) 80 W 
E) 22 W 
A) 54 W 
B) 71 W 
C) 90 W 
D) 80 W 
E) 22 W

Question 19

What is the equivalent resistance between points a and b when R = 12$\Omega$?

Accepted Answer

A) 20 $\Omega$ 
B) 16$\Omega$ 
C) 24$\Omega$ 
D) 28 $\Omega$ 
E) 6.0 $\Omega$ 
A) 20 $\Omega$ 
B) 16$\Omega$ 
C) 24$\Omega$ 
D) 28 $\Omega$ 
E) 6.0 $\Omega$

Question 20

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

Exam 21: Current and Direct Current Circuits

At what rate is power supplied by the 10-V emf shown below?

The circuit below contains three 100-W light bulbs and a capacitor.The emf is 110 V and the capacitor is fully charged.Which light bulb(s)is(are)brightest?

If R = 4.0 k Ω\OmegaΩ ,C = 3.0 mF, ε\varepsilonε = 15 V,Q = 12 mC,and I = 2.0 mA,what is the potential difference Vb- Va?

The capacitors are completely discharged in the circuit shown below. The two resistors have the same resistance R and the two capacitors have the same capacitance C.After the switch is closed,the current

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?

At what rate is thermal energy generated in the 5- Ω\OmegaΩ resistor when ε\varepsilonε = 24 V?

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

In an RC circuit,what fraction of the final energy is stored in an initially uncharged capacitor after it has been charging for 3.0 time constants?

A wire (length = 2.0 m,diameter = 1.0 mm)has a resistance of 0.45 Ω\OmegaΩ .What is the resistivity of the material used to make the wire?

If Q = 400 μ\muμ C and the potential difference VA - VB = -10 V in the circuit segment shown below,what is the current in the resistor?

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

The circuit below contains 3 100-W light bulbs and a capacitor.The emf is 110 V.Which light bulb(s)is(are)brightest? (Assume the capacitor is fully charged. )

If 480 C pass through a 4.0- Ω\OmegaΩ resistor in 10 min,what is the potential difference across the resistor?

A cook plugs a 500 W crockpot and a 1 000 W kettle into a 240 V power supply,all operating on direct current.When we compare the two,we find that

A copper cable is to be designed to carry a current of 300 A with a power loss of only 2.0 watts per meter.What is the required radius of the copper cable? (The resistivity of copper is 1.7 * 10 - 8 Ω\OmegaΩ . m. )

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

What maximum power can be generated from an 18-V emf using any combination of a 6.0- Ω\OmegaΩ resistor and a 9.0- Ω\OmegaΩ resistor?

What is the equivalent resistance between points a and b when R = 12 Ω\OmegaΩ ?

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

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 R = 4.0 k $\Omega$ ,C = 3.0 mF, $\varepsilon$ = 15 V,Q = 12 mC,and I = 2.0 mA,what is the potential difference V_b- V_a? $If R = 4.0 k \Omega ,C = 3.0 mF, \varepsilon = 15 V,Q = 12 mC,and I = 2.0 mA,what is the potential difference V<sub>b</sub>- V<sub>a</sub>?$

At what rate is thermal energy generated in the 5- $\Omega$ resistor when $\varepsilon$ = 24 V? $At what rate is thermal energy generated in the 5- \Omega resistor when \varepsilon = 24 V?$

A wire (length = 2.0 m,diameter = 1.0 mm)has a resistance of 0.45 $\Omega$ .What is the resistivity of the material used to make the wire?

If Q = 400 $\mu$ C and the potential difference V_A - V_B = -10 V in the circuit segment shown below,what is the current in the resistor? $If Q = 400 \mu C and the potential difference V<sub>A</sub> - V<sub>B</sub> = -10 V in the circuit segment shown below,what is the current in the resistor?$

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

If 480 C pass through a 4.0- $\Omega$ resistor in 10 min,what is the potential difference across the resistor?

A copper cable is to be designed to carry a current of 300 A with a power loss of only 2.0 watts per meter.What is the required radius of the copper cable? (The resistivity of copper is 1.7 * 10 ^- ⁸ $\Omega$ . m. )

What maximum power can be generated from an 18-V emf using any combination of a 6.0- $\Omega$ resistor and a 9.0- $\Omega$ resistor?

What is the equivalent resistance between points a and b when R = 12 $\Omega$ ? $What is the equivalent resistance between points a and b when R = 12 \Omega ?$

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