We know that Lorentz force on a test charge particle moving through a magnetic field is given by $$F=q_\text{test}\cdot(V_\text{test} \cdot B_\text{source/externalfield} \cdot \sin\theta)$$ where $\theta$ is the angle between velocity of the charged particle and the external magnetic field $B$. But we also know that the moving test charge produces its own magnetic field, will this reduce the net force on the test charge by the external magnetic field? If so, what would be the formula?
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