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.
Chronic neck and back pain can lead to recurrent muscles spasms. Large muscle groups make up the trunk, including the neck, chest wall, upper back, and lower back. Spasms in these muscles can be a result of an injury or they may develop over time because of arthritic changes in the spine.