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# a charge q experiences no net force at a particular point in space. which of the following situations described below must always be true?

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### James

Guys, does anyone know the answer?

get a charge q experiences no net force at a particular point in space. which of the following situations described below must always be true? from EN Bilgi.

## Electric charges and force (tricky test question)

On my physics test yesterday, one of the questions was the following: At a particular point in space, a charge Q experiences no force. It follows that...

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## Electric charges and force (tricky test question)

Thread starter vmc303 Start date Feb 18, 2006 Feb 18, 2006 #1 vmc303

On my physics test yesterday, one of the questions was the following:

At a particular point in space, a charge Q experiences no force. It follows that

A. if charges are nearby, the total positive charge must equal the total negative charge.

B. there is not enough information to tell whether there are nearby charges or not.

C. if charges are nearby, they have the opposite sign of Q

D. there are no charges nearby

E. if charges are nearby, their total charge must add up to zero.

I answered D, but according to the test key, the correct answer was B. I had initially put B, but when I realized that the problem said "no force" instead of "no net force," it was clear that D was the correct answer. Do I have a case? I'm guessing that the teacher meant it to read "no net force," but the distinction is a very important one for this question.

Feb 18, 2006 #2 Doc Al Mentor

I don't think you have a case. The electrostatic force experienced by a charge depends on the field it is exposed to. While you can use superposition to add the contributions to the field from all charges, it is inaccurate to say that a charge experiencing no electrostatic force is really being pulled equally in all directions. The charge experiences no force.

Feb 18, 2006 #3 gulsen

I guess "experiences no force" means "(feels) no net force".

Feb 18, 2006 #4 nrqed vmc303 said:

On my physics test yesterday, one of the questions was the following:

At a particular point in space, a charge Q experiences no force. It follows that

A. if charges are nearby, the total positive charge must equal the total negative charge.

B. there is not enough information to tell whether there are nearby charges or not.

C. if charges are nearby, they have the opposite sign of Q

D. there are no charges nearby

E. if charges are nearby, their total charge must add up to zero.

I answered D, but according to the test key, the correct answer was B. I had initially put B, but when I realized that the problem said "no force" instead of "no net force," it was clear that D was the correct answer. Do I have a case? I'm guessing that the teacher meant it to read "no net force," but the distinction is a very important one for this question.

They meant no net force. Then, either there is no force at all or there are 2 or more forces cancelling each other. It is therefore impossible to say anything about the charges nearby.

Pat Feb 18, 2006 #5 vmc303 nrqed said:

They meant no net force. Then, either there is no force at all or there are 2 or more forces cancelling each other. It is therefore impossible to say anything about the charges nearby.

Pat

The problem is that it didn't say "no net force," it said "no force." It's not at all a trivial distinction in this case. The teacher has often harped on the difference between net force and force, and I assumed this was his attempt to trip people up on that subtlety. Given that the charge experience *no* force at all, the only answer choice which logically follows is D. After all, if it experiences no forces, how could there possibly be any charges nearby?

Last edited: Feb 18, 2006

Feb 18, 2006 #6 nrqed vmc303 said:

The problem is it said "no force," not "no net force." It's not at all a trivial distinction in this case. The teacher has often harped on the difference between net force and force, and I assumed this was his attempt to trip people up on that subtlety. Given that the charge experience *no* force at all, the only answer choice which logically follows is D. After all, if it experiences no forces, how could there possibly be any charges nearby?

I understand. And you are right, indeed.

But it would be very artificial to say that one knows that an object experiences no force. Physically, this would make no sense because there is no physical way to tell that an object experiences no forces at all. It is impossible, *physically*, to make any statement about anything else than the net force on an object. If you observe a particle in an experiment and it has no acceleration, you will never be able to say anything else than that the net force is zero.

I understand your point of view, and yes, if we talk about semantics, syaing there is no force on the particle would imply that there is no other charge (or any other mass!) around. But from a physics point of view, one can only talk about net force.

This all boils down to how finicky the prof is and if he makes distinction between semantics and physics. I know that when I teach my students, whenever I talk about the force on a particle (with no other specification), it always means the net force. The only exception is if I ask ``what is the force on that charge due to this other specific charge``.

regards Pat Feb 18, 2006 #7 vmc303 nrqed said:

I understand. And you are right, indeed.

But it would be very artificial to say that one knows that an object experiences no force. Physically, this would make no sense because there is no physical way to tell that an object experiences no forces at all. It is impossible, *physically*, to make any statement about anything else than the net force on an object. If you observe a particle in an experiment and it has no acceleration, you will never be able to say anything else than that the net force is zero.

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## A charge Q experiences no net force at a particular point in space. Which of the following situations described below must ALWAYS be true?

Free video and text solution: Answer:-There are no other charges nearby.Explanation:-There are no other charges nearby.If there is no net charge in nearby space then the force on this charge will be ZERO-If there are other charges nearby, they must all have the same sign as Q.There there is nearby charge of same sign then it will have repulsion force on Q-If there are other charges nearby, they must all have the opposite sign of Q.if there is nearby charge of opposite sign then the force must be attraction force.-If there are other charges nearby, the total positive charge must equal the total negative charge.If there exist two type of charges nearby then there may exist either attraction or repulsion force on it | Snapsolve

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## A charge Q experiences no net force at a particular point in space. Which of the following situations described below must ALWAYS be true?-There are no other charges nearby.-If there are other charges nearby, they must all have the same sign as Q.-If there are other charges nearby, they must all have the opposite sign of Q.-If there are other charges nearby, the total positive charge must equal the total negative charge.-None of the Above

Question Physics

A charge Q experiences no net force at a particular point in space. Which of the following situations described below must ALWAYS be true?

-There are no other charges nearby.

-If there are other charges nearby, they must all have the same sign as Q.

-If there are other charges nearby, they must all have the opposite sign of Q.

-If there are other charges nearby, the total positive charge must equal the total negative charge.

-None of the Above

-There are no other charges nearby.

Explanation:

-There are no other charges nearby.

If there is no net charge in nearby space then the force on this charge will be ZERO

-If there are other charges nearby, they must all have the same sign as Q.

There there is nearby charge of same sign then it will have repulsion force on Q

-If there are other charges nearby, they must all have the opposite sign of Q.

if there is nearby charge of opposite sign then the force must be attraction force.

-If there are other charges nearby, the total positive charge must equal the total negative charge.

If there exist two type of charges nearby then there may exist either attraction or repulsion force on it

4.6

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