Solved

really basic question about coulomb's law

Posted on 2010-08-15
2
321 Views
Last Modified: 2012-05-10
Hi

I think i know the answer to this already but I'm just asking as a means to consolidate it really.

Formula = q1.q2.k /d^2

You are often asked to use this formula to find, for example, the force of q1 on q2. This can make you think that the force of q2 on q1 is somehow different because the wording in the question doesnt suggest they are one and the same thing.

But the fact of the matter is that when you have 2 point electric charges the force of q1 on q2 is the same magnitude (opposite) direction as the force of q2 on q1 even though say q1 could have a large value for charge and q2 doesn't

I hope thats right :)

Edit: i was also thinking the same thing about electric fields. When books describe an electric field they talk about the electric force on the test charge from the source charge and it 'sounds' as though the force is one directional. But again i hope i'm right in presuming that whatever total force the source charge exerts on the test charge (not the force per coulomb but the total force on all of the test charge) then the source charge feels that back?
0
Comment
Question by:andieje
2 Comments
 
LVL 27

Accepted Solution

by:
d-glitch earned 500 total points
ID: 33440392
>> when you have 2 point electric charges the force of q1 on q2 is the same  
      magnitude (opposite) direction as the force of q2 on q1

That is correct, forces are always equal and opposite.  

The difference in magnitude of the charges is not relevant.  But a difference in the masses might be.  If one of the charges is very heavy, you might be able to treat it
as stationary.

This is also true in the case of electric fields.  Older televisions and oscilloscopes used
electric deflection plates to bend a beam of electrons.  The force of the electrons on
the plates is negligible.
0
 

Author Closing Comment

by:andieje
ID: 33440509
thanks
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
C#: Compare two audio files and calculate matching percentage 6 486
Volume Calculation 14 53
Calculating Z-SCORE inside Excel. 4 86
Auto Adjust Percent rate 5 31
Introduction On a scale of 1 to 10, how would you rate our Product? Many of us have answered that question time and time again. But only a few of us have had the pleasure of receiving a stack of the filled out surveys and being asked to do somethi…
Have you ever thought of installing a power system that generates solar electricity to power your house? Some may say yes, while others may tell me no. But have you noticed that people around you are now considering installing such systems in their …
As a trusted technology advisor to your customers you are likely getting the daily question of, ‘should I put this in the cloud?’ As customer demands for cloud services increases, companies will see a shift from traditional buying patterns to new…
This is a video describing the growing solar energy use in Utah. This is a topic that greatly interests me and so I decided to produce a video about it.

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now