<https://www.physicsforums.com/threads/proton-in-a-changing-magnetic-field.230490/>
<http://schema.org/image>
<https://www.physicsforums.com/styles/physicsforums/xenforo/logo.og.png>
<https://www.physicsforums.com/threads/proton-in-a-changing-magnetic-field.230490/>