 of a charged particle moving in an axially symmetric magnetic field with a magnetic flux enveloped in a circle centered on the axis and passing through the point at which the particle is located.</p>
<p>Consider the charge $ q $ moving in a magnetic field <span class="math notranslate nohighlight">\(\vec B = (B_r, 0, B_z)\)</span>. We equate the <span class="math notranslate nohighlight">\(\theta\)</span> component of the Lorentz force with the time derivative of the momentum divided by <span class="math n