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.
Painful Back Spasm. A spasm is a powerful contraction or stiffening of the muscle. A muscle spasm can occur due to a variety of reasons and can be a terrifying experience, especially in the postural musculature. When a muscle goes into spasm, the person is unable to stop the forcible tightening of the muscle and surrounding tissue.