Call Now to Set Up Tutoring:

(888) 888-0446

AP Physics 2 : Electric Force Between Point Charges

Study concepts, example questions & explanations for AP Physics 2

Create An Account

All AP Physics 2 Resources

6 Diagnostic Tests 149 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #111 : Electricity And Magnetism

Coloumbs law for varsity

Charge has a charge of 4 nC

Charge has a charge of -7nC

The distance between their centers, is 6.5 mm .

What is the magnitude of the force on due to ?

Possible Answers:

$|\overrightarrow{F}|=7.5*10^{-3}{N}$

$|\overrightarrow{F}|=9.1*10^{-3}{N}$

$|\overrightarrow{F}|=3.8*10^{-3}{N}$

None of these

$|\overrightarrow{F}|=6.0*10^{-3}{N}$

Correct answer:

$|\overrightarrow{F}|=6.0*10^{-3}{N}$

Explanation:

Using Coulomb's law:

$\overrightarrow{E}=k\frac{q_A q_B}{r^2}$

Where is $9.0*10^9 N\frac{m^2}{C^2}$

q_A is charge , in Coulombs

q_B is charge , in Coulombs

is the distance, in meters.

Convert to and plug in values:

$\overrightarrow{F}=9.0*10^9\frac{4*10^{-9}*-7*10^{-9}}{.0065^2}$

$\overrightarrow{F}=-6.0*10^{-3}{N}$

Magnitude is equivalent to absolute value:

$|\overrightarrow{F}|=6.0*10^{-3}{N}$

Report an Error

Example Question #12 : Electric Force Between Point Charges

Coloumbs law for varsity

Charge has a charge of 4 nC

Charge has a charge of 5nC

The distance between their centers, is 1.5 mm .

What is the magnitude of the force on due to ?

Possible Answers:

$|\overrightarrow{F}|=8.0*10^{-2}{N}$

$|\overrightarrow{F}|=8.0*10^{-1}{N}$

$|\overrightarrow{F}|=1.3*10^{-2}{N}$

None of these

$|\overrightarrow{F}|=4.3*10^{-2}{N}$

Correct answer:

$|\overrightarrow{F}|=8.0*10^{-2}{N}$

Explanation:

Using Coulomb's law:

$\overrightarrow{E}=k\frac{q_A q_B}{r^2}$

Where is $9.0*10^9 N\frac{m^2}{C^2}$

q_A is charge , in Coulombs

q_B is charge , in Coulombs

is the distance, in meters.

Convert to and plug in values:

$\overrightarrow{F}=9.0*10^9\frac{4*10^{-9}*5*10^{-9}}{.0015^2}$

$\overrightarrow{F}=8.0*10^{-2}{N}$

Magnitude is equivalent to absolute value:

$|\overrightarrow{F}|=8.0*10^{-2}{N}$

Report an Error

Example Question #11 : Electric Force Between Point Charges

A point charge of Q sits at rest next to another charge of 3Q at a distance of R away. How does the force on Q from 3Q compare with the force on 3Q from Q?

Possible Answers:

The forces are equal

The force on the Q charge is two times larger

The force on the Q charge is four times larger

The force on the 3Q charge is two times larger

Correct answer:

The forces are equal

Explanation:

Newton's third law states that any force interactions between two bodies must be equal. This is not so simple when another body is introduced. However, with two bodies, any force that acts on the other will have an equal and opposite reaction force.

Report an Error

Example Question #12 : Electric Force Between Point Charges

A point charge of Q and speed v heads towards another charge of 3Q. Assume the charges are relatively close to one another How does the force on Q from 3Q compare with the force on 3Q from Q?

Possible Answers:

The force on the Q charge is twice as large

The force on the 3Q charge is four times as large

The forces are equal

The force on the 3Q charge is one-fourth as large

Correct answer:

The forces are equal

Explanation:

Newton's third law states that any force interactions between two bodies must be equal. This is not so simple when another body is introduced. However, with two bodies, any force on acts on the other will have an equal and opposite reaction force. The fact that one of the bodies is moving is irrelevant when considering the relative magnitudes of the Newton's Third law pair.

Report an Error

Example Question #13 : Electric Force Between Point Charges

Two nuclei are 1nm apart. Determine the magnitude of the electrical force of one on the other.

$k=9*10^9N\frac{m^2}{C^2}$

Possible Answers:

$F=9.2*10^{-10}N$

$F=5.5*10^{-10}N$

$F=7.7*10^{-10}N$

$F=6.9*10^{-10}N$

$F=3.1*10^{-10}N$

Correct answer:

$F=9.2*10^{-10}N$

Explanation:

Use Coulombs Law:

$F=k\frac{q_1q_2}{r^2}$

Where $k=9*10^9N\frac{m^2}{C^2}$

Convert to and plug in values:

$F=9*10^9\frac{3.2*10^{-19}*3.2*10^{-19}}{(1*10^{-9})^2}$

$F=9.2*10^{-10}N$

Report an Error

Example Question #64 : Electrostatics

How will the force between two positively charged objects change as they are brought closer together?

Possible Answers:

The repulsive forces will increase

It is impossible to determine

The force will change from repulsive to attractive

The repulsive force will decrease

The attractive forces will increase

Correct answer:

The repulsive forces will increase

Explanation:

Report an Error

Example Question #65 : Electrostatics

Charge A and B are $15\textup{ cm}$ apart. If charge A has a charge of $2 \textup{ nC}$ and a mass of $2\textup{ mg}$ , charge B has a charge of $4\textup{ nC}$ and a mass of $10\textup{ mg}$ , determine the acceleration of A due to B.

Possible Answers:

$.0016\ \frac{\textup{m}}{\textup{ s}^2}$

None of these

$.0044\ \frac{\textup{m}}{\textup{ s}^2}$

$.0011\ \frac{\textup{m}}{\textup{ s}^2}$

$.0032\ \frac{\textup{m}}{\textup{ s}^2}$

Correct answer:

$.0016\ \frac{\textup{m}}{\textup{ s}^2}$

Explanation:

Using Coulomb's law:

$F=k\frac{q_1q_2}{r^2}$

Using

F=ma

Combining equations:

$a=k\frac{q_1q_2}{mr^2}$

Converting to and to and plugging in values:

$a=9*10^9\frac{2*10^{-9}*4*10^{-9}}{2*10^{-3}.15^2}$

$a=.0016\frac{m}{s^2}$

Report an Error

Example Question #66 : Electrostatics

Charge A and B are $15\textup{ cm}$ apart. If charge A has a charge of $2\textup{ nC}$ and a mass of $2\textup{ mg}$ , charge B has a charge of $4\textup{ nC}$ and a mass of $10\textup{ mg}$ , determine the acceleration of B due to A.

Possible Answers:

$1.1*10^{-4}\ \frac{\textup{m}}{\textup{ s}^2}$

$6.6*10^{-4}\ \frac{\textup{m}}{\textup{ s}^2}$

$3.2*10^{-4}\ \frac{\textup{m}}{\textup{ s}^2}$

None of these

$8.4*10^{-4}\ \frac{\textup{m}}{\textup{ s}^2}$

Correct answer:

$3.2*10^{-4}\ \frac{\textup{m}}{\textup{ s}^2}$

Explanation:

Using Coulomb's law:

$F=k\frac{q_1q_2}{r^2}$

Using

F=ma

Combining equations:

$a=k\frac{q_1q_2}{mr^2}$

Converting to and to and plugging in values:

$a=9*10^9\frac{2*10^{-9}*4*10^{-9}}{10*10^{-3}.15^2}$

$a=3.2*10^{-4}\frac{m}{s^2}$

Report an Error

Example Question #14 : Electric Force Between Point Charges

Two electrons are deep in space and apart. Determine the force of one electron on the other.

Possible Answers:

$2.3*10^{-28}N$

None of these

2.3N

$7.5*10^{-18}N$

7.5N

Correct answer:

$2.3*10^{-28}N$

Explanation:

Using

$F_{elec}=k\frac{q_1q_2}{r^2}$

Plugging in values:

$F_{elec}=9.0*10^9\frac{({-1.6*10^{-19}})^2}{1^2}$

$F_{elec}=2.3*10^{-28}N$

Report an Error

Example Question #20 : Electric Force Between Point Charges

A mobile 50g , 10nC charge is perfectly balanced on top of a stationary 50nC charge. What will be the equilibrium height of the mobile charge?

Possible Answers:

.007m

None of these

.003m

.075m

.038m

Correct answer:

.003m

Explanation:

Using

$F_{elec}=k\frac{q_1q_2}{r^2}$

$F_{net}=mg+F_{elec}$

Combining equations and plugging in values:

$.050*9.8+9.0*10^9\frac{10*10^{-9}*50*10^{-9}}{r^2}=0$

Solving for

r=.003m

Report an Error

View Tutors

Pamela
Certified Tutor

Mount Holyoke College, Bachelor in Arts, English. Columbia University in the City of New York, Master of Public Policy, Inter...

View Tutors

Anthony
Certified Tutor

CUNY New York City College of Technology, Bachelor of Science, Civil Engineering.

View Tutors

Chiquita
Certified Tutor

Troy University, Bachelor of Science, Education. University of Phoenix-Atlanta Campus, Master of Arts, Adult and Continuing E...

All AP Physics 2 Resources

6 Diagnostic Tests 149 Practice Tests Question of the Day Flashcards Learn by Concept

Popular Subjects

Reading Tutors in Boston, Spanish Tutors in Miami, Spanish Tutors in Dallas Fort Worth, Calculus Tutors in Washington DC, Math Tutors in San Francisco-Bay Area, Chemistry Tutors in Seattle, Calculus Tutors in Miami, ISEE Tutors in Philadelphia, Reading Tutors in Phoenix, English Tutors in Denver

Popular Courses & Classes

GRE Courses & Classes in Houston, MCAT Courses & Classes in Atlanta, MCAT Courses & Classes in San Francisco-Bay Area, ISEE Courses & Classes in San Francisco-Bay Area, Spanish Courses & Classes in Seattle, SAT Courses & Classes in Boston, Spanish Courses & Classes in Atlanta, MCAT Courses & Classes in Los Angeles, SAT Courses & Classes in Philadelphia, ISEE Courses & Classes in Denver

Popular Test Prep

GRE Test Prep in Houston, SAT Test Prep in Boston, SSAT Test Prep in Atlanta, MCAT Test Prep in San Diego, GMAT Test Prep in Philadelphia, ISEE Test Prep in New York City, LSAT Test Prep in Philadelphia, ISEE Test Prep in Miami, SSAT Test Prep in Philadelphia, SSAT Test Prep in Phoenix

DMCA Complaint

If you believe that content available by means of the Website (as defined in our Terms of Service) infringes one or more of your copyrights, please notify us by providing a written notice (“Infringement Notice”) containing the information described below to the designated agent listed below. If Varsity Tutors takes action in response to an Infringement Notice, it will make a good faith attempt to contact the party that made such content available by means of the most recent email address, if any, provided by such party to Varsity Tutors.

Your Infringement Notice may be forwarded to the party that made the content available or to third parties such as ChillingEffects.org.

Please be advised that you will be liable for damages (including costs and attorneys’ fees) if you materially misrepresent that a product or activity is infringing your copyrights. Thus, if you are not sure content located on or linked-to by the Website infringes your copyright, you should consider first contacting an attorney.

Please follow these steps to file a notice:

You must include the following:

A physical or electronic signature of the copyright owner or a person authorized to act on their behalf; An identification of the copyright claimed to have been infringed; A description of the nature and exact location of the content that you claim to infringe your copyright, in \ sufficient detail to permit Varsity Tutors to find and positively identify that content; for example we require a link to the specific question (not just the name of the question) that contains the content and a description of which specific portion of the question – an image, a link, the text, etc – your complaint refers to; Your name, address, telephone number and email address; and A statement by you: (a) that you believe in good faith that the use of the content that you claim to infringe your copyright is not authorized by law, or by the copyright owner or such owner’s agent; (b) that all of the information contained in your Infringement Notice is accurate, and (c) under penalty of perjury, that you are either the copyright owner or a person authorized to act on their behalf.

Send your complaint to our designated agent at:

Charles Cohn Varsity Tutors LLC
101 S. Hanley Rd, Suite 300
St. Louis, MO 63105

Or fill out the form below:

Do not fill in this field

Contact Information

* Full legal name

Company name

* Phone number

* Email address

Address

* Address1

Address2

* City

* State

* Zipcode

* Country

Complaint Details

* URL of copyrighted work (where your original material is located)

* Please describe the copyrighted work so that it may be easily identified

I am the owner, or an agent authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.

I have a good faith belief that the use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.

This notification is accurate.

I acknowledge that there may be adverse legal consequences for making false or bad faith allegations of copyright infringement by using this process.

* Signature (your digital signature is legally binding)

HIGH SCHOOL

GRADUATE SCHOOL

K-8

Search 50+ Tests

math tutoring

science tutoring

foreign languages

elementary tutoring

other

Search 350+ Subjects

AP Physics 2 : Electric Force Between Point Charges

Study concepts, example questions & explanations for AP Physics 2

All AP Physics 2 Resources

Example Questions

Example Question #111 : Electricity And Magnetism

Example Question #12 : Electric Force Between Point Charges

Example Question #11 : Electric Force Between Point Charges

Example Question #12 : Electric Force Between Point Charges

Example Question #13 : Electric Force Between Point Charges

Example Question #64 : Electrostatics

Example Question #65 : Electrostatics

Example Question #66 : Electrostatics

Example Question #14 : Electric Force Between Point Charges

Example Question #20 : Electric Force Between Point Charges

All AP Physics 2 Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: