Question 1

If there is an electric field inside of a conductor,then current must be flowing through this conductor.

Accepted Answer

A) True 
 B)False  True

Question 2

A 4.0 m length of gold wire is connected to a 1.5 V battery,and a current of 4.0 mA flows through it.What is the diameter of the wire? (The resistivity of gold is 2.44 × 10-8 Ω·m. )

Accepted Answer

A) 17 μm 
B) 8.5 μm 
C) 48 μm 
D) 9.0 μm 
A) 17 μm 
B) 8.5 μm 
C) 48 μm 
D) 9.0 μm A

Question 3

A current flowing through a copper wire (which is connected to a battery)is due to

Accepted Answer

A) electrons being accelerated by an electric field. 
B) positively charged particles being pushed off the battery terminal. 
C) electrons being bumped by positively charged particles. 
D) positively charged particles being attracted to the negative terminal of a battery. 
A) electrons being accelerated by an electric field. 
B) positively charged particles being pushed off the battery terminal. 
C) electrons being bumped by positively charged particles. 
D) positively charged particles being attracted to the negative terminal of a battery. A

Question 4

How much current will be flowing through a 40.0 m length of copper wire with radius 4.0 mm if it is connected to a source supplying 16.0 V? (The resistivity of copper is 1.68 × 10-8 Ω·m. )

Accepted Answer

A) 1200 A 
B) 9.5 x 108 A 
C) 68 nA 
D) 710 A 
A) 1200 A 
B) 9.5 x 108 A 
C) 68 nA 
D) 710 A

Question 5

When current is flowing in a metal,the electrons are moving at nearly the speed of light.

Accepted Answer

A) True 
 B)False

Question 6

A component with a 17 Ω resistor is rated for use at power levels not exceeding 14 W.How much current can safely flow through the component?

Accepted Answer

A) 0.91 A 
B) 1.21 A 
C) 238 A 
D) 0.22 A 
A) 0.91 A 
B) 1.21 A 
C) 238 A 
D) 0.22 A

Question 7

A rechargeable battery that is completely drained of electrical energy can be completely charged by applying 6.0 mA of current for 1.0 h.If the battery acquires an emf of 1.0 V in the process of being charged,how much energy is the battery capable of storing?

Accepted Answer

A) 22 J 
B) 6.0 mJ 
C) 0.20 kJ 
D) 1.7 μJ 
A) 22 J 
B) 6.0 mJ 
C) 0.20 kJ 
D) 1.7 μJ

Question 8

In the metal wires of a circuit,the electron current i flows from the negative to the positive end of a battery,but the current I flows from the positive to the negative end of the battery.

Accepted Answer

A) True 
 B)False

Question 9

Where does the energy go that an electron has gained from the electric field when the electron passes through a conductor that has resistivity?

Accepted Answer

The answer of Where does the energy go that an...

Question 10

If you double the diameter of a cylindrical wire,you double its conductivity but reduce its resistivity by one half.

Accepted Answer

A) True 
 B)False

Question 11

The charge carriers in metals are electrons,but this is not necessarily true for other types of material.

Accepted Answer

A) True 
 B)False

Question 12

A device experiences a voltage drop of 4.0 V across it while a current of 4.0 mA flows through it.How much power does it dissipate?

Accepted Answer

A) 16 mW 
B) 64 μW 
C) 4.0 kW 
D) 1.0 kW 
A) 16 mW 
B) 64 μW 
C) 4.0 kW 
D) 1.0 kW

Question 13

If the length and diameter of a wire of circular cross section are both doubled,the resistance is

Accepted Answer

A) unchanged. 
B) doubled. 
C) increased fourfold. 
D) halved. 
E) None of these are true. 
A) unchanged. 
B) doubled. 
C) increased fourfold. 
D) halved. 
E) None of these are true.

Question 14

Lightening is a discharge of electrons that commonly is greater than is needed to neutralize a positive charge.A series of strokes,each in the opposite direction of the previous stroke,occur to overcome this excessive discharge.Why do all of these strokes follow the same path,causing a flickering effect?

Accepted Answer

The intense electron

Question 15

A 5.0 V battery storing 43.0 kJ of energy supplies 1.5 A of current to a circuit.How much energy does the battery have left after powering the circuit for 1.0 h?

Accepted Answer

A) 16 kJ 
B) 27 kJ 
C) 43 kJ 
D) 41 kJ 
A) 16 kJ 
B) 27 kJ 
C) 43 kJ 
D) 41 kJ

Question 16

A battery is rated that it provides 1.0 mW of power at 9.0 V when fully charged.How much current can it deliver?

Accepted Answer

A) 0.11 mA 
B) 81 kA 
C) 0.33 mA 
D) 9.0 kA 
A) 0.11 mA 
B) 81 kA 
C) 0.33 mA 
D) 9.0 kA

Question 17

A wire has a current of 6.0 mA in it.How many electrons pass a given point in a minute?

Accepted Answer

A) 2.3 × 1018 
B) 360 
C) 6.3 × 1014 
D) 5.4 × 10-15 
A) 2.3 × 1018 
B) 360 
C) 6.3 × 1014 
D) 5.4 × 10-15

Question 18

Which has the higher resistance,a piece of wire with diameter d or a piece of wire the same length,composed of the same material,but having a diameter

Accepted Answer

The piece of wire wi

Question 19

A tube of mercury with resistivity 9.84 × 10-7 Ω·m has a 23.0 N/C electric field inside the column of mercury.How much current is flowing,if the diameter of the tube is ?

Accepted Answer

A) 18 A 
B) 180 A 
C) 29 A 
D) 280 A 
A) 18 A 
B) 180 A 
C) 29 A 
D) 280 A

Question 20

As current flows through a uniform wire,the wire gets hotter because the electrons slow down and therefore transform their lost kinetic energy into thermal energy in the wire.

Accepted Answer

A) True 
 B)False

Exam 22: Current and Resistance

If there is an electric field inside of a conductor,then current must be flowing through this conductor.

A 4.0 m length of gold wire is connected to a 1.5 V battery,and a current of 4.0 mA flows through it.What is the diameter of the wire? (The resistivity of gold is 2.44 × 10-8 Ω·m. )

A current flowing through a copper wire (which is connected to a battery)is due to

How much current will be flowing through a 40.0 m length of copper wire with radius 4.0 mm if it is connected to a source supplying 16.0 V? (The resistivity of copper is 1.68 × 10-8 Ω·m. )

When current is flowing in a metal,the electrons are moving at nearly the speed of light.

A component with a 17 Ω resistor is rated for use at power levels not exceeding 14 W.How much current can safely flow through the component?

A rechargeable battery that is completely drained of electrical energy can be completely charged by applying 6.0 mA of current for 1.0 h.If the battery acquires an emf of 1.0 V in the process of being charged,how much energy is the battery capable of storing?

In the metal wires of a circuit,the electron current i flows from the negative to the positive end of a battery,but the current I flows from the positive to the negative end of the battery.

Where does the energy go that an electron has gained from the electric field when the electron passes through a conductor that has resistivity?

If you double the diameter of a cylindrical wire,you double its conductivity but reduce its resistivity by one half.

The charge carriers in metals are electrons,but this is not necessarily true for other types of material.

A device experiences a voltage drop of 4.0 V across it while a current of 4.0 mA flows through it.How much power does it dissipate?

If the length and diameter of a wire of circular cross section are both doubled,the resistance is

A 5.0 V battery storing 43.0 kJ of energy supplies 1.5 A of current to a circuit.How much energy does the battery have left after powering the circuit for 1.0 h?

A battery is rated that it provides 1.0 mW of power at 9.0 V when fully charged.How much current can it deliver?

A wire has a current of 6.0 mA in it.How many electrons pass a given point in a minute?

Which has the higher resistance,a piece of wire with diameter d or a piece of wire the same length,composed of the same material,but having a diameter

A tube of mercury with resistivity 9.84 × 10-7 Ω·m has a 23.0 N/C electric field inside the column of mercury.How much current is flowing,if the diameter of the tube is ?

As current flows through a uniform wire,the wire gets hotter because the electrons slow down and therefore transform their lost kinetic energy into thermal energy in the wire.

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Circular Motion,orbits,and Gravity

Rotational Motion

Equilibrium and Elasticity

Momentum

Energy and Work

Using Energy

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Circuits

Magnetic Fields and Forces

Electromagnetic Induction and Electromagnetic Waves

Ac Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

Filters

A 4.0 m length of gold wire is connected to a 1.5 V battery,and a current of 4.0 mA flows through it.What is the diameter of the wire? (The resistivity of gold is 2.44 × 10^-8 Ω·m. )

How much current will be flowing through a 40.0 m length of copper wire with radius 4.0 mm if it is connected to a source supplying 16.0 V? (The resistivity of copper is 1.68 × 10^-8 Ω·m. )

A tube of mercury with resistivity 9.84 × 10^-7Ω·m has a 23.0 N/C electric field inside the column of mercury.How much current is flowing,if the diameter of the tube is ?