An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil, spiral or helix. Electromagnetic coils are used in electrical engineering, in applications where electric currents interact with magnetic fields, in devices such as inductors, electromagnets, transformers, and sensor coils.
Causes of lower back spasms. Back spasms can be the result of injuries to the muscles, tendons, and ligaments in the back or it can be related to more serious medical conditions. Heavy lifting is a common cause of back spasms. Any activity that puts excessive strain on the muscles and ligaments in the lower back can cause an injury.
Back spasms may occur if you have arthritis or a ruptured disk in your spine. Arthritis in the lower back can put pressure on the spinal cord, which may cause pain in the back and the legs. A ruptured or bulging disk in the vertebrae may also pressure a nerve, which can result in back pain.