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 cramps can be painful and debilitating, and can be caused by a number of different things. Injury to the back, such as a pulled muscle, is one of the most common causes of back cramps. Poor posture, overexertion through exercise, improper lifting methods, or even menstrual cramps can all cause back pain as well, however, in addition to issues with the vertebrates of the spine. The most common cause of back cramps is physical injury.