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 are experienced when there is an unusual and involuntary contraction of muscle due to strain, muscle pain or weakness associated to injury or disorder. It usually occurs close to the spinal cord or adjacent to the nerve roots, leading in and out the spinal cord. This brings pressure on the nerves, which causes severe pain.