Magnetic field of a single charged particle

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A moving charged particle, such as q1, generates a magnetic field that is circular in nature, similar to the field produced by a current-carrying wire. The strength of this magnetic field varies based on the distance and direction from the moving charge. The circular shape arises from the fundamental principles of electromagnetism, specifically the right-hand rule, which describes the orientation of the magnetic field relative to the charge's motion. This behavior is consistent regardless of the presence of other charges, as the magnetic field is solely dependent on the motion of the charged particle. Understanding this concept is crucial for grasping the interactions between charged particles and their associated fields.
yrjosmiel
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Let's say that there's nothing else in this universe except for 2 charged particles: q1 and q2.
q1 is moving relative to q2, moving at velocity v. I've read that a magnetic field is made by a moving charge. In this case, the moving charge q1 is moving relative to q2. What would the magnetic field made by q1 look like? Would it look circular, like the ones made by a current-carrying wire?
 
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It would be circular, yes.
Is it circular just because it is or is there some other reason why?
 

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