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.
A back spasm is a sudden and involuntary contraction, or uncontrollable tightening, of a muscle in response to strain, overuse, weakness, or muscle pain related to injury or a disorder.Back spasms often occur near the spinal cord or near the nerve roots that lead in and out of the spinal cord.eek prompt medical care if you are being treated for spinal stenosis or a herniated disc but symptoms recur or are persistent.If your back spasm is persistent or causes you concern, seek prompt medical care. 1  Previous. 2  1. 3  2.