The video also highlighted the magnetic fields created by the neodymium magnet. The coil of the holding magnet is connected across the line. They have a neodymium or other rare-earth permanent magnet. Positioned close to the magnet is a solenoid. There are two metal balls on one end of the magnet. This was as opposed to traditional designs that used magnet windings on the outside. The simplest example of a one sided flux magnet is a refrigerator magnet. Detection of helium loss from the helium vessel of an MRI superconducting magnet. This is accomplished by the placement of a permanent magnet within the piston. This field acts against the permanent magnet. The torque on the cup increases with the speed of rotation of the magnet. Another form of coilgun is one which consists of a strong magnet on a rail. Specifically, they are of a type called an interior permanent magnet (IPM) machine (or motor). In 1884 Otto developed ignition with a low voltage magnet. Access to free transportation is a key component in facilitating racial diversity in magnet schools.