Free Practice Quiz Question List

1 Electric Charge and Fields Online Quiz Questions

Use this free practice quiz with 20 questions to review 1 Electric Charge and Fields, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

An object can become charged through electron transfer without changing the total charge of an isolated system.

A
True
B
False

Choose one

1 point

Two stationary point charges have opposite signs. What is the nature of the force each exerts on the other?

A
Attractive
B
Repulsive
C
Zero
D
Cannot be determined from the signs

True or false

1 point

At a point in an electric field, the field direction is the direction of the force on a positive test charge placed there.

A
True
B
False

Written response

1 point

What principle states that the electric field from multiple source charges is found by adding their individual field vectors?

Fill in the blank

1 point

For fixed source charges, Coulomb’s force magnitude is proportional to the of the separation.

Choose one

1 point

Which statement best describes charge quantization for an object?

A
The net charge must be a positive integer multiple of $e$ .
B
The net charge must be an integer multiple of $e$ , which can be positive, negative, or zero.
C
The net charge can have any real value because electrons transfer continuously.
D
The net charge must be either $+e$ or $-e$ .

Choose all

1 point

Select all statements that correctly describe the electric field.

A
It is defined as electric force per unit positive test charge.
B
Its SI unit is the newton per coulomb.
C
Fields from multiple source charges add vectorially.
D
Its direction is defined as the force direction on a negative test charge.

Fill in the blank

1 point

Gauss’s law gives the net electric flux through a closed surface as the net enclosed charge divided by .

Choose one

1 point

A uniform electric field of $500\,\text{N/C}$ crosses a flat surface of area $0.040\,\text{m}^2$ . The angle between the field and the surface’s area vector is $60^\circ$ . What is the electric flux through the surface?

A
$0\,\text{N}\cdot\text{m}^2/\text{C}$
B
$5\,\text{N}\cdot\text{m}^2/\text{C}$
C
$10\,\text{N}\cdot\text{m}^2/\text{C}$
D
$20\,\text{N}\cdot\text{m}^2/\text{C}$

Written response

1 point

A positive test charge of $2.0\times10^{-3}\,\text{C}$ experiences a force of $0.60\,\text{N}$ at a point. What is the electric field magnitude at that point? Enter the numerical value in N/C.

Choose all

1 point

Select all statements that correctly describe Gauss’s law and its use.

A
The net flux through a closed surface is determined by the net charge enclosed.
B
Charges outside the surface can affect the field on the surface without changing the net flux through it.
C
The law is especially useful for finding fields when the charge distribution has sufficient symmetry.
D
The law is valid only for spherical Gaussian surfaces.

Choose one

1 point

At a point near an isolated negative point charge, which way does the electric field point?

A
Away from the source charge
B
Toward the source charge
C
Perpendicular to the line connecting the point and the source
D
In a direction determined by the test charge’s sign

Open ended

1 point

How does choosing a Gaussian surface that matches a charge distribution’s symmetry help you use Gauss’s law to find the electric field?

True or false

1 point

For a flat surface in a uniform electric field, the flux is zero when the field is parallel to the surface.

A
True
B
False

Choose one

1 point

Two point charges, $+4.0\,\mu\text{C}$ and $+1.0\,\mu\text{C}$ , are separated by $0.20\,\text{m}$ in vacuum. Using $k_e=8.99\times10^9\,\frac{\text{N}\cdot\text{m}^2}{\text{C}^2}$ , what is the magnitude of the force between them?

A
$0.090\,\text{N}$
B
$0.899\,\text{N}$
C
$1.80\,\text{N}$
D
$3.60\,\text{N}$

Choose one

1 point

Two objects in an isolated system become charged when electrons transfer from one object to the other. Which conclusion must be true?

A
The total charge of the two-object system changes because electrons move.
B
Electrons move between the objects, but the total charge of the isolated system remains constant.
C
The objects must end with equal and opposite charges.
D
Protons move between the objects, changing the total charge of the system.

Choose one

1 point

A positive point charge and a negative point charge are stationary. What is the direction of the electric force on the negative charge?

A
Away from the positive charge, because the charges have opposite signs.
B
Perpendicular to the line joining the charges.
C
Toward the positive charge, along the line joining the charges.
D
There is no force because the charges have different signs.

Choose one

1 point

Two point charges remain unchanged while their separation is doubled. By what factor does the magnitude of the Coulomb force change?

A
It becomes one-fourth as large.
B
It becomes one-half as large.
C
It stays the same.
D
It becomes twice as large.

Written response

1 point

Two point charges have magnitudes $2.0\,\mu\text{C}$ and $3.0\,\mu\text{C}$ , and are separated by $0.20\,\text{m}$ in vacuum. Using $k_e=8.99\times10^9\,\frac{\text{N}\cdot\text{m}^2}{\text{C}^2}$ , what is the magnitude of their force, rounded to the nearest $0.01\,\text{N}$ ?

Written response

1 point

A point charge of $+2.0\,\text{nC}$ is observed at a distance of $0.30\,\text{m}$ . Using $k_e=8.99\times10^9\,\text{N}\cdot\text{m}^2/\text{C}^2$ , what is the electric-field magnitude, rounded to the nearest $10\,\text{N/C}$ ?