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.
Causes of Muscle Spasms. Muscle spasms in the back can often be caused by a twisting or strain on one of the back muscles, which in turn causes involuntary muscle contractions. Although this often occurs when tense, tight back muscles are present, it can happen in any circumstance.s a result of the contraction people often complain of having symptoms of either a locked back, or a knot in their back. Among the most common causes of muscle spasms in the back... 1  a sneeze or cough. 2  lifting heavy objects. 3  incorrect sitting posture. 4  muscle overuse, or injury. 5  dehydration.