F = qvB in Relativity: A Charge in Magnetic Field

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IPhO' 2008
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A charge q has a velocity v in the magnetic field B if v is nearly to velocity of light.
Can we use F = qvB.
Thank you.
 
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If the source of magnetic field has a velocity vs .
F = ? :confused:
 
F depends only on B, not where it came from. The F means dp/dt.