Right hand grip rule solenoid coil. If I connect this small solenoid to a power supply, we can see that the piston can be pulled in by the electromagnetic field as soon as current starts to flow through the coil. If I cut the power then the spring will force the piston back to it's original position.
Mar 07, 2020 · The right hand rule. Thumb – force/motion, First finger – field, second finger – current F = B × I × l A coil of wire carrying a current in a magnetic field experiences a force that makes it rotate.