Electromagnetism static charge and forces

  • #1
Hi
Everyone, I'm trying to justify to myself why

|F(a)| > |F(b)| > |F(c)|

Capture.PNG


I think I can see why

|F(b)| > |F(c)|

due to special relativity case c observed from
the charges point of view would observe
the charges closer due to lorentz
contraction. As the charge is invariant would
result in a greater force?

However I can't justify to myself why
|F(a)| > |F(b)|

many thanks
 

Answers and Replies

  • #2
A.T.
Science Advisor
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2,481
would observe the charges closer due to lorentz contraction.
In which direction is the contraction?
 
  • #3
Please ignore my justification, I see now it's wrong


Im Just trying to find out why

|F(a)| > |F(b)| > |F(c)|

I know that |F(a)| and |F(c)| have the same
electric force independent of motion and that the weaker force
experienced by |F(c)| is a result magnetic attraction

but can't see why
|F(a)| > |F(b)|

I'm new to electromagnetism

many thanks
 

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